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HomeMy WebLinkAboutExhibit A.HP Guidelines Criteria.211 W Hopkins Ave Page 1 of 13 Exhibit A Historic Preservation Design Guidelines Criteria Staff Findings 26.415.070.D Major Development. No building, structure or landscape shall be erected, constructed, enlarged, altered, repaired, relocated or improved involving a designated historic property or a property located within a Historic District until plans or sufficient information have been submitted to the Community Development Director and approved in accordance with the procedures established for their review. An application for a building permit cannot be submitted without a development order. 3. Final Development Plan Review: b) The procedures for the review of final development plans for major development projects are as follows: 1) The Community Development Director shall review the application materials submitted for final development plan approval. If they are determined to be complete, the applicant will be notified in writing of this and a public hearing before the HPC shall be scheduled. Notice of the hearing shall be provided pursuant to Paragraphs 26.304.060.E.3.a, b and c. 2) Staff shall review the submittal material and prepare a report that analyzes the project's conformance with the design guidelines and other applicable Land Use Code sections. This report will be transmitted to the HPC with relevant information on the proposed project and a recommendation to continue, approve, disapprove or approve with conditions and the reasons for the recommendation. The HPC will review the application, the staff analysis report and the evidence presented at the hearing to determine the project's conformance with the City Historic Preservation Design Guidelines. 3) The HPC may approve, disapprove, approve with conditions or continue the application to obtain additional information necessary to make a decision to approve or deny. If the application is approved, the HPC shall issue a certificate of appropriateness and the Community Development Director shall issue a development order. 4) Before an application for a building permit can be submitted, a final set of plans reflecting any or all required changes by the HPC or City Council must be on file with the City. Any conditions of approval or outstanding issues which must be addressed in the field or at a later time shall be noted on the plans. Page 2 of 13 Page 3 of 13 Page 4 of 13 Relevant Historic Preservation Design Guidelines for Final Review: The applicable design guidelines for this Final level of review are listed below. 1.1 All projects shall respect the historic development pattern or context of the block, neighborhood or district. • Building footprint and location should reinforce the traditional patterns of the neighborhood. • Allow for some porosity on a site. In a residential project, setback to setback development is typically uncharacteristic of the historic context. Do not design a project which leaves no useful open space visible from the street. 1.4 Design a new driveway or improve an existing driveway in a manner that minimizes its visual impact. • If an alley exists at the site, the new driveway must be located off it. • Tracks, gravel, light grey concrete with minimal seams, or similar materials are appropriate for driveways on Aspen Victorian properties. 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. 1.7 Provide positive open space within a project site. • Ensure that open space on site is meaningful and consolidated into a few large spaces rather than many small unusable areas. • Open space should be designed to support and complement the historic building. 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 Page 5 of 13 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. 1.9 Landscape development on AspenModern landmarks shall be addressed on a case by case basis. 1.10 Built-in furnishings, such as water features, fire pits, grills, and hot tubs, that could interfere with or block views of historic structures are inappropriate. • Site furnishings that are added to the historic property should not be intrusive or degrade the integrity of the neighborhood patterns, site, or existing historic landscape. • Consolidating and screening these elements is preferred. 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. • 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. Page 6 of 13 • 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. • 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. Page 7 of 13 • 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. 1.17 No fence in the front yard is often the most appropriate solution. Reserve fences for back yards and behind street facing façades, as the best way to preserve the character of a property. 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 8 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. 1.26 Preserve the historic circulation system. • Minimize the impact of new vehicular circulation. • Minimize the visual impact of new parking. • Maintain the separation of pedestrian and vehicle which occurred historically. 1.27 Preserve and maintain significant landscaping on site. • Protect established vegetation during any construction. • If any tree or shrub needs to be removed, replace it with the same or similar species. • New planting should be of a species used historically or a similar species. • Maintain and preserve any gardens and/or ornamental planting on the site. • Maintain and preserve any historic landscape elements. 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. 3.1 Preserve the functional and decorative features of a historic window. • Features important to the character of a window include its frame, sash, muntins/mullions, sills, heads, jambs, moldings, operations, and groupings of windows. Page 9 of 13 • Repair frames and sashes rather than replacing them. • Preserve the original glass. If original Victorian era glass is broken, consider using restoration glass for the repair. 3.2 Preserve the position, number, and arrangement of historic windows in a building wall. • Enclosing a historic window is inappropriate. • Do not change the size of an original window opening. 3.3 Match a replacement window to the original in its design. • If the original is double-hung, then the replacement window must also be double-hung. If the sash have divided lights, match that characteristic as well. 3.4 When replacing an original window, use materials that are the same as the original. 3.5 Preserve the size and proportion of a historic window opening. • Changing the window opening is not permitted. • Consider restoring an original window opening that was enclosed in the past. 3.6 Match, as closely as possible, the profile of the sash and its components to that of the original window. • A historic window often has a complex profile. Within the window’s casing, the sash steps back to the plane of the glazing (glass) in several increments. These increments, which individually only measure in eighths or quarters of inches, are important details. They distinguish the actual window from the surrounding plane of the wall. • The historic profile on AspenModern properties is typically minimal. 3.8 Use a storm window to enhance energy conservation rather than replace a historic window. • Install a storm window on the interior, when feasible. This will allow the character of the original window to be seen from the public way. • If a storm window is to be installed on the exterior, match the sash design and material of the original window. It should fit tightly within the window opening without the need for sub- frames or panning around the perimeter. A storm window should not include muntins unless necessary for structure. Any muntin should be placed to match horizontal or vertical divisions of the historic window. 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 10 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. 4.7 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. 5.1 Preserve an original porch or balcony. • Replace missing posts and railings when necessary. Match the original proportions, material and spacing of balusters. • Expanding the size of a historic porch or balcony is inappropriate. 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. 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. 7.5 Preserve original chimneys, even if they are made non-functional. • Reconstruct a missing chimney when documentation exists. 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. Page 11 of 13 • 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. 9.5 A new foundation shall appear similar in design and materials to the historic foundation. • On modest structures, a simple foundation is appropriate. Constructing a stone foundation on a miner’s cottage where there is no evidence that one existed historically is out of character and is not allowed. • Exposed concrete or painted metal flashing are generally appropriate. • Where a stone or brick foundation existed historically, it must be replicated, ideally using stone salvaged from the original foundation as a veneer. The replacement must be similar in the cut of the stone and design of the mortar joints. • New AspenModern foundations shall be handled on a case by case basis to ensure preservation of the design intent. 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. 11.6 Design a new structure to be recognized as a product of its time. • Consider these three aspects of a new building; form, materials, and fenestration. A project 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. • When choosing to relate to building form, use forms that are similar to the historic resource. • When choosing to relate to materials, use materials that appear similar in scale and finish to those used historically on the site and use building materials that contribute to a traditional sense of human scale • When choosing to relate to fenestration, use windows and doors that are similar in size and shape to those of the historic resource. 11.7 The imitation of older historic styles is discouraged. • This blurs the distinction between old and new buildings. • Overall, details shall be modest in character. 12.3 Exterior light fixtures should be simple in character. Page 12 of 13 • 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. • 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. 12.6 Signs should not obscure or damage historic building fabric. • Where possible, install a free standing sign that is appropriate in height and width. Consolidate signage for multiple businesses. • Mount signs so that the attachment point can be easily repaired when the sign is replaced. Do not mount signage directly into historic masonry. • Blade signs or hanging signs are generally preferred to wall mounted signs because the number of attachment points may be less. • Signs should be constructed of wood or metal. • Pictographic signs are encouraged because they add visual interest to the street. Staff Findings: The basic concept of this project, preserving the Pan Abode with no addition, and placing all new construction in a detached rear unit is an ideal preservation outcome. Page 13 of 13 At this level of review, final details of the landscape plan are under consideration. Staff finds that the selection and location of plant materials are sympathetic to the resource and maintain a simple setting in the foreground of the property. Staff recommends more study of the front walkway. Currently a flagstone walk leads to the front door. This walkway is fairly informal, with stones set on grade, and appears to be narrower in width than the proposed 5’ path. Staff requests consideration of more narrow path and a different approach to conceal the lid of a drywell that is proposed to sit within the walkway. The drywell lid will be filled with matching stone, but will likely read as an obvious “intrusion” in the surface. There are a few pieces of mechanical equipment and amenities that are proposed to sit in the yards and which will require further vetting at permit review. A spa in the west sideyard may be determined to be partially in the foreground of a structure (the rear unit), which is not permitted. Staff finds the location of a large a/c unit on the east side of the Pan Abode to be somewhat exposed and recommends the unit be at least set into the ground to the extent possible. All exterior mechanical units are required to operate below certain decibel levels when measured from property lines in order to prevent a nuisance to neighbors. The proposed units, including the generator in the rear yard, must meet this standard, to be confirmed at permit. The project includes small lightwells adjacent to the structures. One lightwell on the west side of the Pan Abode is labeled to be surrounded by a guardrail. Low profile grates are typically required. The curb around the lightwells must also be only the minimum necessary for function; no more than 6” above the surrounding grade. The application includes guideline compliant restoration work on the Pan Abode, including removal of a non-original addition and restoration of the rear facade, removing non-historic paint and shutters, and restoring windows. Prior to permit submittal, the applicant must submit cut sheets for the original windows which are to be put back in place once the rear addition is removed. When construction is underway, a site visit with staff will be needed to review any original Pan Abode logs which are proposed to be replaced due to deterioration. Staff must also review test patches to study the appropriate technique for stripping the non-historic paint off of the logs. Further information about the roof plan are needed to identify flashing material, the snow stop specification, and the location of all vents. Regarding the detached new home, the site plan and massing were accepted at Conceptual review and materiality was discussed to some degree. Staff finds the design meets the guidelines.