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HomeMy WebLinkAboutExhibit A HP Design Guidelines.820 E Cooper Ave Page 1 of 7 Exhibit A Historic Preservation Design Guidelines Criteria Staff Findings NOTE: Staff responses begin on page 7 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 7 Relevant Historic Preservation Design Guidelines: 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. Chapter 1: Site Planning & Landscape Design MET NOT MET 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. 1.7 Provide positive open space within a project site. 1.8 Consider stormwater quality needs early in the design process. 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. Chapter 4: Rehabilitation - Doors MET NOT MET 4.2 Maintain the original size of a door and its opening. 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. Chapter 9: New Construction - Excavation, Building Relocation & Foundations MET NOT MET 9.5 A new foundation shall appear similar in design and materials to the historic foundation. 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. 10.8 Design an addition to be compatible in size and scale with the main building. 10.10 Place an addition at the rear of a primary building or set it back substantially from the front to minimize the visual impact on the historic structure and to allow the original proportions and character to remain prominent. 10.11 Roof forms shall be compatible with the historic building. 10.12 Design an addition to a historic structure that does not destroy or obscure historically important architectural features. MET MET CONDITION CONDITION CONDITION MET CONDITION MET MET MET MET MET MET Historic Preservation Design Guidelines Review Criteria for 820 E. Cooper The applicant is requesting Minor Development review for this project. The proposed design must meet applicable Historic Preservation Design Guidelines. MET CONDITION MET Page 3 of 7 • 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 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. 1.12 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. • Contemporary landscapes that highlight an AspenModern architectural style are encouraged. Page 4 of 7 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. • Climbing vines can damage historic structures and are not allowed. 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. 4.4 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. Page 5 of 7 • 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. 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. 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 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 Page 6 of 7 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. 10.8 Design an addition to be compatible in size and scale with the main building. • An addition that is lower than, or similar to the height of the primary building, is preferred. 10.10 Place an addition at the rear of a primary building or set it back substantially from the front to minimize the visual impact on the historic structure and to allow the original proportions and character to remain prominent. • Locating an addition at the front of a primary building is inappropriate. • Additions to the side of a primary building are handled on a case-by-case basis and are approved based on site specific constraints that restrict rear additions. • Additional floor area may also be located under the building in a basement which will not alter the exterior mass of a building. 10.11 Roof forms shall be compatible with the historic building. • A simple roof form that does not compete with the historic building is appropriate. • On Aspen Victorian properties, a flat roof may only be used on an addition to a gable roofed structure if the addition is entirely one story in height, or if the flat roofed areas are limited, but the addition is primarily a pitched roof. Page 7 of 7 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. Staff Finding: The applicable sections of the design guidelines are as follows: site planning, doors, foundations, and new additions. Design Guidelines 1.8 addresses stormwater mitigation. Engineering has provided comments that the amount of site disturbance may trigger stormwater requirements for the site with the direction that pervious pavers may be used to address these concerns. The applicant will need to continue working with all relevant City Departments, specifically Engineering and Parks to ensure all requirements are met for this site. Staff recommends the applicant provide visuals of the proposed pavers for review and approval by staff and monitor prior to its installation. Design Guidelines 1.12 focuses on the site context of historic structures. Areas that were not historically covered with hard surfaces should maintain the historic condition of sod or plantings. The proposed brick pavers along the foundation of the historic home would not be appropriate. Staff recommends this area be restored to sod or plantings that do not cover the historic resource. In addition, the site must provide for two on-site parking spaces as required by the land use code. Design Guidelines 4.2 & 4.4 concerns the restoration of historic doors and openings. Currently, the dimensions of the historic front door and transom do not match historic configurations. The restoration of this opening may require additional siding that must be woven in with the historic siding. Staff supports the restoration of this important feature and recommends the cut sheets for the new door and transom be provided for staff and monitor review and approval. Design Guidelines 9.5 focuses on the details for a new foundation. The historic house is on a slab on grade foundation with a small subgrade level to the rear that houses mechanical equipment. A new foundation is proposed for the enlarged addition and exposed concrete or painted mental flashing is considered appropriate. In summary, staff recommends approval with conditions listed in the memo and draft resolution.