Alterations to a qualified historic building or facility must comply with the minimum requirements for alterations in 4.1.6. Use the applicable survey forms for new construction for each altered element or space.

If it is determined, in accordance with the required procedures in 4.1.7(2), that the proposed alterations would threaten or destroy the historic significance of the building or facility, the following alternative requirements in 4.1.7(3) may be utilized:

• Site Accessible Route - Minimum Number: At least one accessible route complying with 4.3 must be provided from a site access point to an accessible entrance.

• Ramps - Slope and Rise: A ramp with a slope no steeper than 1:6 may be used as part of an accessible route to an entrance but the run must not exceed 2 feet.

• Entrances - Minimum Number and Primary Entrance: At least one accessible entrance complying with 4.14 and which is used by the public must be provided. If no public entrance can be made accessible, then access may be provided at any entrance which is open (unlocked) when directional signage is provided at the primary public entrance. The alternative accessible entrance must have a notification system, and where security is a concern, remote monitoring may be used. Building Accessible Route - Access to Other Floors: Accessible routes from an accessible entrance to all publicly used spaces must be provided at least on the accessible entrance level. Access must be provided in compliance with 4.1 to all levels of a building and facility whenever practicable.

• Toilet Rooms - Unisex: If toilets are provided, then at least one toilet facility, which may be unisex in design, complying with 4.22 and 4.1.6, must be provided on an accessible route.

• Displays: Displays and written information should be located so as to be seen by a seated person.

If it is determined, in accordance with the required procedures in 4.1.7(2), that it is not feasible to provide physical access to a qualified historic building or facility using the alternative requirements in 4.1.7(3) without threatening or destroying the historic significance of the building or facility, alternative methods of access must be provided. See 36 CFR _36.405(b).

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