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HomeMy WebLinkAboutExhibit A HP Guidelines Criteria.930 King St Page 1 of 13 Exhibit A Historic Preservation Design Guidelines Criteria Staff Findings NOTE: Staff responses begin on page 12 of this exhibit, following the list of applicable guidelines. 26.415.070.C Minor Development. 1. The review and decision on the issuance of a certificate of appropriateness for minor development shall begin with a determination by the Community Development Director that the proposed project constitutes a minor development. Minor development work includes: a) Expansion or erection of a structure wherein the increase of the floor area of the structure is two hundred and fifty (250) square feet or less or b) Alterations to a building façade, windows, doors, roof planes or material, exterior wall materials, dormer porch, exterior staircase, balcony or ornamental trim when three (3) or fewer elements are affected and the work does not qualify for a certificate of no negative effect or c) Erection or installation of a combination or multiples of awning, canopies, mechanical equipment, fencing, signs, accessory features and other attachments to designated properties such that the cumulative impact does not allow for the issuance of a certificate of no negative effect or d) Alterations that are made to non-historic portions of a designated historic property that do not qualify for a certificate of no negative effect or e) The erection of street furniture, signs, public art and other visible improvements within designated historic districts of a magnitude or in numbers such that the cumulative impact does not allow for the issuance of a certificate of no negative effect. The Community Development Director may determine that an application for work on a designated historic property involving multiple categories of minor development may result in the cumulative impact such that it is considered a major development. In such cases, the applicant shall apply for a major development review in accordance with Subsection 26.415.07.D. Page 2 of 13 Chapter 1: Site Planning & Landscape Design MET NOT MET 1.3 Remove driveways or parking areas accessed directly from the street if they were not part of the original development of the site. 1.5 Maintain the historic hierarchy of spaces. 1.6 Provide a simple walkway running perpendicular from the street to the front entry on residential projects. 1.8 Consider stormwater quality needs early in the design process. 1.11 Preserve and maintain historically significant landscaping on site, particularly landmark trees and shrubs. 1.12 Provide an appropriate context for historic structures. See diagram. 1.13 Additions of plant material to the landscape that could interfere with or block views of historic structures are inappropriate. 1.14 Minimize the visual impacts of landscape lighting. 1.18 When building an entirely new fence, use materials that are appropriate to the building type and style. 1.19 A new fence should have a transparent quality, allowing views into the yard from the street. 1.20 Any fence taller than 42” should be designed so that it avoids blocking public views of important features of a designated building. Chapter 2: Rehabilitation - Building Materials MET NOT MET 2.1 Preserve original building materials. 2.2 The finish of materials should be as it would have existed historically. 2.3 Match the original material in composition, scale and finish when replacing materials on primary surfaces. 2.4 Do not use synthetic materials as replacements for original building materials. 2.5 Covering original building materials with new materials is inappropriate. 2.6 Remove layers that cover the original material. Chapter 4: Rehabilitation - Doors MET NOT MET 4.1 Preserve historically significant doors. 4.2 Maintain the original size of a door and its opening. 4.3 When a historic door or screen door is damaged, repair it and maintain its general historic appearance. 4.4 When replacing a door or screen door, use a design that has an appearance similar to the original door or a door associated with the style of the building. 4.7 Preserve historic hardware.MET MET MET MET MET CONDITION MET MET MET CONDITION CONDITION Historic Preservation Design Guidelines Review Criteria for 930 King Street The applicant is requesting Minor Development review to remodel and expand the existing non-historic addition. The proposed design must meet applicable Historic Preservation Design Guidelines. MET MET MET CONDITION MET CONDITION MET MET MET CONDITION CONDITION Page 3 of 13 Chapter 6: Rehabilitation - Architectural Details MET NOT MET 6.1 Preserve significant architectural features. 6.2 When disassembly of a historic element is necessary for its restoration, use methods that minimize damage to the original material. 6.3 Remove only the portion of the detail that is deteriorated and must be replaced. 6.4 Repair or replacement of missing or deteriorated features are required to be based on original designs. 6.5 Do not guess at “historic” designs for replacement parts. Chapter 7: Rehabilitation - Roofs MET NOT MET 7.1 Preserve the original form of a roof. 7.2 Preserve the original eave depth. 7.4 New vents should be minimized, carefully, placed and painted a dark color. 7.8 New or replacement roof materials should convey a scale, color and texture similar to the original. 7.10 Design gutters so that their visibility on the structure is minimized to the extent possible. Chapter 8: Rehabilitation - Secondary Structures MET NOT MET 8.1 If an existing secondary structure is historically significant, then it must be preserved. 8.5 Preserve the original building materials, or match in kind when necessary. 8.8 Adaptation of an obsolete secondary structure to a functional use is encouraged. Chapter 9: New Construction - Excavation, Building Relocation & Foundations MET NOT MET 9.6 Minimize the visual impact of lightwells. Chapter 10: New Construction - Building Additions MET NOT MET 10.3 Design a new addition such that one's ability to interpret the historic character of the primary building is maintained. 10.4 The historic resource is to be the focus of the property, the entry point, and the predominant structure as viewed from the street. 10.6 Design a new addition to be recognized as a product of its own time. 10.12 Design an addition to a historic structure that does not destroy or obscure historically important architectural features. Chapter 12: Accessibility, Lighting, Mech. Equipment, Services Areas & Signs MET NOT MET 12.2 Original light fixtures must be maintained. When there is evidence as to the appearance of original fixtures that are no longer present, a replication is appropriate. 12.3 Exterior light fixtures should be simple in character. 12.4 Minimize the visual impacts of utilitarian areas, such as mechanical equipment and trash storage.MET MET MET MET MET MET MET MET MET MET CONDITION MET MET MET MET MET MET MET MET MET MET Page 4 of 13 Relevant Historic Preservation Design Guidelines: 1.3 Remove driveways or parking areas accessed directly from the street if they were not part of the original development of the site. • Do not introduce new curb cuts on streets. • Non-historic driveways accessed from the street should be removed if they can be relocated to the alley. 1.5 Maintain the historic hierarchy of spaces. • Reflect the established progression of public to private spaces from the public sidewalk to a semi- public walkway, to a semi private entry feature, to private spaces. 1.6 Provide a simple walkway running perpendicular from the street to the front entry on residential projects. • Meandering walkways are not allowed, except where it is needed to avoid a tree or is typical of the period of significance. • Use paving materials that are similar to those used historically for the building style and install them in the manner that they would have been used historically. For example on an Aspen Victorian landmark set flagstone pavers in sand, rather than in concrete. Light grey concrete, brick or red sandstone are appropriate private walkway materials for most landmarks. • The width of a new entry sidewalk should generally be three feet or less for residential properties. A wider sidewalk may be appropriate for an AspenModern property. 1.8 Consider stormwater quality needs early in the design process. • When included in the initial planning for a project, stormwater quality facilities can be better integrated into the proposal. All landscape plans presented for HPC review must include at least a preliminary representation of the stormwater design. A more detailed design must be reviewed and approved by Planning and Engineering prior to building permit submittal. • Site designs and stormwater management should provide positive drainage away from the historic landmark, preserve the use of natural drainage and treatment systems of the site, reduce the generation of additional stormwater runoff, and increase infiltration into the ground. Stormwater facilities and conveyances located in front of a landmark should have minimal visual impact when viewed from the public right of way. • Refer to City Engineering for additional guidance and requirements. 1.11 Preserve and maintain historically significant landscaping on site, particularly landmark trees and shrubs. • Retaining historic planting beds and landscape features is encouraged. • Protect historically significant vegetation during construction to avoid damage. Removal of damaged, aged, or diseased trees must be approved by the Parks Department. • If a significant tree must be removed, replace it with the same or similar species in coordination with the Parks Department. • The removal of non-historic planting schemes is encouraged. • Consider restoring the original landscape if information is available, including original plant materials. 1.12 Provide an appropriate context for historic structures. See diagram. Page 5 of 13 • Simplicity and restraint are required. Do not overplant a site, or install a landscape which is overtextured or overly complex in relationship to the historic resource, particularly in Zone A. In Zone A, new planting shall be species that were used historically or species of similar attributes. • In areas immediately adjacent to the landmark, Zone A and Zone B, plants up 42” in height, sod, and low shrubs are often appropriate. • Contemporary planting, walls and other features are not appropriate in Zone A. A more contemporary landscape may surround new development or be located in the rear of the property, in Zone C. • Do not cover areas which were historically unpaved with hard surfaces, except for a limited patio where appropriate. • Where residential structures are being adapted to commercial use, proposals to alter the landscape will be considered on a case-by-case basis. The residential nature of the building must be honored. • In the case of a historic landmark lot split, careful consideration should be given so as not to over plant either property, or remove all evidence of the landscape characteristics from before the property was divided. • Contemporary landscapes that highlight an AspenModern architectural style are encouraged. 1.13 Additions of plant material to the landscape that could interfere with or block views of historic structures are inappropriate. • Low plantings and ground covers are preferred. • Do not place trees, shrubs, or hedgerows in locations that will obscure, damage, or block significant architectural features or views to the building. Hedgerows are not allowed as fences. Page 6 of 13 • Consider mature canopy size when planting new trees adjacent to historic resources. Planting trees too close to a landmark may result in building deteriorate or blocked views and is inappropriate. • Climbing vines can damage historic structures and are not allowed. 1.14 Minimize the visual impacts of landscape lighting. • Landscape and pathway lighting is not permitted in Zone A (refer to diagram) on Aspen Victorian properties unless an exception is approved by HPC based on safety considerations. • Landscape, driveway, and pathway lighting on AspenModern properties is addressed on a case- by-case basis. • Landscape light fixtures should be carefully selected so that they are compatible with the building, yet recognizable as a product of their own time. • Driveway lighting is not permitted on Aspen Victorian properties. • Landscape uplighting is not allowed. 1.18 When building an entirely new fence, use materials that are appropriate to the building type and style. • The new fence should use materials that were used on similar properties during the period of significance. • A wood fence is the appropriate solution in most locations. • Ornate fences, including wrought iron, may create a false history are not appropriate for Aspen Victorian landmarks unless there is evidence that a decorative fence historically existed on the site. • A modest wire fence was common locally in the early 1900s and is appropriate for Aspen Victorian properties. This fence type has many desirable characteristics including transparency, a low height, and a simple design. When this material is used, posts should be simply detailed and not oversized. 1.19 A new fence should have a transparent quality, allowing views into the yard from the street. • A fence that defines a front yard must be low in height and transparent in nature. • For a picket fence, spacing between the pickets must be a minimum of 1/2 the width of the picket. • For Post-WWII properties where a more solid type of fence may be historically appropriate, proposals will be reviewed on a case-by-case basis. • Fence columns or piers should be proportional to the fence segment. 1.20 Any fence taller than 42” should be designed so that it avoids blocking public views of important features of a designated building. • A privacy fence should incorporate transparent elements to minimize the possible visual impacts. Consider staggering the fence boards on either side of the fence rail. This will give the appearance of a solid plank fence when seen head on. Also consider using lattice, or other transparent detailing on the upper portions of the fence. Page 7 of 13 • A privacy fence should allow the building corners and any important architectural features that are visible from the street to continue to be viewed. • All hedgerows (trees, shrub bushes, etc.) are prohibited in Zones A and B. 2.1 Preserve original building materials. • Do not remove siding that is in good condition or that can be repaired in place. • Masonry features that define the overall historic character, such as walls, cornices, pediments, steps and foundations, should be preserved. • Avoid rebuilding a major portion of an exterior wall that could be repaired in place. Reconstruction may result in a building which no longer retains its historic integrity. • Original AspenModern materials may be replaced in kind if it has been determined that the weathering detracts from the original design intent or philosophy. 2.2 The finish of materials should be as it would have existed historically. • Masonry naturally has a water-protective layer to protect it from the elements. Brick or stone that was not historically painted shall not be painted. • If masonry that was not painted historically was given a coat of paint at some more recent time, consider removing it, using appropriate methods. • Wood should be painted, stained or natural, as appropriate to the style and history of the building. 2.3 Match the original material in composition, scale and finish when replacing materials on primary surfaces. • If the original material is wood clapboard for example, then the replacement material must be wood as well. It should match the original in size, and the amount of exposed lap and finish. • Replace only the amount required. If a few boards are damaged beyond repair, then only those should be replaced, not the entire wall. For AspenModern buildings, sometimes the replacement of a larger area is required to preserve the integrity of the design intent. 2.4 Do not use synthetic materials as replacements for original building materials. • Original building materials such as wood siding and brick should not be replaced with synthetic materials. 2.5 Covering original building materials with new materials is inappropriate. • Regardless of their character, new materials obscure the original, historically significant material. • Any material that covers historic materials may also trap moisture between the two layers. This will cause accelerated deterioration to the historic material which may go unnoticed. 2.6 Remove layers that cover the original material. • Once the non-historic siding is removed, repair the original, underlying material. 4.1 Preserve historically significant doors. • Maintain features important to the character of a historic doorway. These include the door, door frame, screen door, threshold, glass panes, paneling, hardware, detailing, transoms and flanking sidelights. • Do not change the position and function of original front doors and primary entrances. Page 8 of 13 • If a secondary entrance must be sealed shut, any work that is done must be reversible so that the door can be used at a later time, if necessary. Also, keep the door in place, in its historic position. • Previously enclosed original doors should be reopened when possible. 4.2 Maintain the original size of a door and its opening. • Altering its size and shape is inappropriate. It should not be widened or raised in height. 4.3 When a historic door or screen door is damaged, repair it and maintain its general historic appearance. 4.4 When replacing a door or screen door, use a design that has an appearance similar to the original door or a door associated with the style of the building. • A replica of the original, if evidence exists, is the preferred replacement. • A historic door or screen door from a similar building also may be considered. • Simple paneled doors were typical for Aspen Victorian properties. • Very ornate doors, including stained or leaded glass, are discouraged, unless photographic evidence can support their use. 4.7 Preserve historic hardware. • When new hardware is needed, it must be in scale with the door and appropriate to the style of the building. • On Aspen Victorian properties, conceal any modern elements such as entry key pads. 6.1 Preserve significant architectural features. • Repair only those features that are deteriorated. • Patch, piece-in, splice, or consolidate to repair the existing materials, using recognized preservation methods whenever possible. • On AspenModern properties, repair is preferred, however, it may be more important to preserve the integrity of the original design intent, such as crisp edges, rather than to retain heavily deteriorated material. 6.2 When disassembly of a historic element is necessary for its restoration, use methods that minimize damage to the original material. • Document its location so it may be repositioned accurately. Always devise methods of replacing the disassembled material in its original configuration. 6.3 Remove only the portion of the detail that is deteriorated and must be replaced. • Match the original in composition, scale, and finish when replacing materials or features. • If the original detail was made of wood, for example, then the replacement material should be wood, when feasible. It should match the original in size and finish. 6.4 Repair or replacement of missing or deteriorated features are required to be based on original designs. Page 9 of 13 • The design should be substantiated by physical or pictorial evidence to avoid creating a misrepresentation of the building’s heritage. • When reconstruction of an element is impossible because there is no historical evidence, develop a compatible new design that is a simplified interpretation of the original, and maintains similar scale, proportion and material. 6.5 Do not guess at “historic” designs for replacement parts. • Where scars on the exterior suggest that architectural features existed, but there is no other physical or photographic evidence, then new features may be designed that are similar in character to related buildings. • Using ornate materials on a building or adding new conjectural detailing for which there is no documentation is inappropriate. 7.1 Preserve the original form of a roof. • Do not alter the angle of a historic roof. Preserve the orientation and slope of the roof as seen from the street. • Retain and repair original and decorative roof detailing. • Where the original roof form has been altered, consider restoration. 7.2 Preserve the original eave depth. • Overhangs contribute to the scale and detailing of a historic resource. • AspenModern properties typically have very deep or extremely minimal overhangs that are key character defining features of the architectural style. 7.4 New vents should be minimized, carefully, placed and painted a dark color. • Direct vents for fireplaces are generally not permitted to be added on historic structures. • Locate vents on non-street facing facades. • Use historic chimneys as chases for new flues when possible. 7.8 New or replacement roof materials should convey a scale, color and texture similar to the original. • If a substitute is used, such as composition shingle, the roof material should be earth tone and have a matte, non-reflective finish. • Flashing should be in scale with the roof material. • Flashing should be tin, lead coated copper, galvanized or painted metal and have a matte, non- reflective finish. • Design flashing, such as drip edges, so that architectural details are not obscured. • A metal roof is inappropriate for an Aspen Victorian primary home but may be appropriate for a secondary structure from that time period. • A metal roof material should have a matte, non-reflective finish and match the original seaming. 7.10 Design gutters so that their visibility on the structure is minimized to the extent possible. Page 10 of 13 • Downspouts should be placed in locations that are not visible from the street if possible, or in locations that do not obscure architectural detailing on the building. • The material used for the gutters should be in character with the style of the building. 8.1 If an existing secondary structure is historically significant, then it must be preserved. • When treating a historic secondary building, respect its character-defining features. These include its materials, roof form, windows, doors, and architectural details. • If a secondary structure is not historically significant, then its preservation is optional. The determination of significance is based on documentation of the construction date of the outbuilding and/or physical inspection. A secondary structure that is related to the period of significance of the primary structure will likely require preservation. 8.5 Preserve the original building materials, or match in kind when necessary. 8.8 Adaptation of an obsolete secondary structure to a functional use is encouraged. • The reuse of any secondary structure should be sensitive so that its character is not lost. 9.6 Minimize the visual impact of lightwells. • The size of any lightwell that faces a street should be minimized. • Lightwells must be placed so that they are not immediately adjacent to character defining features, such as front porches. • Lightwells must be protected with a flat grate, rather than a railing or may not be visible from a street. • Lightwells that face a street must abut the building foundation and generally may not “float” in the landscape except where they are screened, or on an AspenModern site. 10.3 Design a new addition such that one’s ability to interpret the historic character of the primary building is maintained. • A new addition must be compatible with the historic character of the primary building. • An addition must be subordinate, deferential, modest, and secondary in comparison to the architectural character of the primary building. • An addition that imitates the primary building’s historic style is not allowed. For example, a new faux Victorian detailed addition is inappropriate on an Aspen Victorian home. • An addition that covers historically significant features is inappropriate. • Proposals on corner lots require particular attention to creating compatibility. 10.4 The historic resource is to be the focus of the property, the entry point, and the predominant structure as viewed from the street. • The historic resource must be visually dominant on the site and must be distinguishable against the addition. • The total above grade floor area of an addition may be no more than 100% of the above grade floor area of the original historic resource. All other above grade development must be completely detached. HPC may consider exceptions to this policy if two or more of the following are met: o The proposed addition is all one story Page 11 of 13 o The footprint of the new addition is closely related to the footprint of the historic resource and the proposed design is particularly sensitive to the scale and proportions of the historic resource o The project involves the demolition and replacement of an older addition that is considered to have been particularly detrimental to the historic resource o The interior of the resource is fully utilized, containing the same number of usable floors as existed historically o The project is on a large lot, allowing the addition to have a significant setback from the street o There are no variance requests in the application other than those related to historic conditions that aren’t being changed o The project is proposed as part of a voluntary AspenModern designation, or o The property is affected by non-preservation related site specific constraints such as trees that must be preserved, Environmentally Sensitive Areas review, etc. 10.6 Design a new addition to be recognized as a product of its own time. • An addition shall be distinguishable from the historic building and still be visually compatible with historic features. • A change in setbacks of the addition from the historic building, a subtle change in material, or a modern interpretation of a historic style are all techniques that may be considered to help define a change from historic construction to new construction. • Do not reference historic styles that have no basis in Aspen. • Consider these three aspects of an addition; form, materials, and fenestration. An addition must relate strongly to the historic resource in at least two of these elements. Departing from the historic resource in one of these categories allows for creativity and a contemporary design response. • Note that on a corner lot, departing from the form of the historic resource may not be allowed. • There is a spectrum of appropriate solutions to distinguishing new from old portions of a development. Some resources of particularly high significance or integrity may not be the right instance for a contrasting addition. 10.12 Design an addition to a historic structure that does not destroy or obscure historically important architectural features. • Loss or alteration of architectural details, cornices, and eavelines must be avoided. 12.2 Original light fixtures must be maintained. When there is evidence as to the appearance of original fixtures that are no longer present, a replication is appropriate. 12.3 Exterior light fixtures should be simple in character. • The design of a new fixture should be appropriate in form, finish, and scale with the structure. • New fixtures should not reflect a different period of history than that of the affected building, or be associated with a different architectural style. • Lighting should be placed in a manner that is consistent with the period of the building, and should not provide a level of illumination that is out of character. • One light adjacent to each entry is appropriate on an Aspen Victorian residential structure. A recessed fixture, surface mounted light, pendant or sconce will be considered if suited to the building type or style. Page 12 of 13 • On commercial structures and AspenModern properties, recessed lights and concealed lights are often most appropriate. 12.4 Minimize the visual impacts of utilitarian areas, such as mechanical equipment and trash storage. • Place mechanical equipment on the ground where it can be screened. • Mechanical equipment may only be mounted on a building on an alley façade. • Rooftop mechanical equipment or vents must be grouped together to minimize their visual impact. Where rooftop units are visible, it may be appropriate to provide screening with materials that are compatible with those of the building itself. Use the smallest, low profile units available for the purpose. • Window air conditioning units are not allowed. • Minimize the visual impacts of utility connections and service boxes. Group them in a discrete location. Use pedestals when possible, rather than mounting on a historic building. • Paint mechanical equipment in a neutral color to minimize their appearance by blending with their backgrounds • In general, mechanical equipment should be vented through the roof, rather than a wall, in a manner that has the least visual impact possible. • Avoid surface mounted conduit on historic structures. Staff Finding: The applicable sections of the design guidelines are as follows: site planning, building materials, and building additions. All relevant Design Guidelines in Chapter 2, 3, 4, 5, 6 and 7 related to the preservation plan need to be reviewed by staff and monitor prior to building permit submittal. Design Guideline 1.8 addresses plans for stormwater mitigation and positive drainage. Due to the additional hardscaping on the property, Engineering has requested drainage capacity calculations for the pervious pavers. This information is to be provided to all relevant City Departments prior to the submission of the building permit. Design Guidelines 1.12, 1.13 & 1.14 deals with plantings and features of the landscape plan. The application proposes flower beds around the front of the historic home, and staff requests the planting schedule to confirm they are low plantings that do not obscure the historic resource. Additionally, staff recommends the reduction of landscape light fixtures along the front walkway to minimize visual impact. Design Guidelines 1.18, 1.19 & 1.20 speaks to the fence design. There is no historic fence to restore or maintain but the newly proposed fence needs to meet requirements related to height and transparency. The applicant has confirmed that the proposed fence will be compliant with both the land use code requirements as well as the Design Guidelines but staff would like to review the design detail prior to building permit submission. Design Guideline 7.1 is related to the restoration and rehabilitation of the historic roof. The applicant proposes to replace the existing porch roof material with a metal roof which could be supported if it is related to building code requirements; however, the proposed corrugated metal is inappropriate because it draws attention to the non-historic material. Staff also finds the built-up profile and change in roof pitch alters the historic appearance. Staff recommends the applicant restudy this feature with Staff and Monitor review. Page 13 of 13 The existing railing on the rooftop deck terminates into the historic roof. The applicant proposes to reduce the visual impact of the railing by replacing the metal railing with a glass railing. While staff supports the changed material, staff requires the termination into the roof be removed. The Building Department also has requirements related to this feature that needs to be met. In summary, staff recommends approval with conditions as listed in draft resolution.