Accessible dwelling units required by §9.152 shall, to the maximum extent feasible, be distributed throughout projects and sites and shall be available in a sufficient range of sizes and amenities so that a qualified individual with disabilities' choice of living arrangements is, as a whole, comparable to that of other persons eligible for housing assistance under the same agency conducted program. This provision shall not be construed to require (but does allow) the provision of an elevator in any multifamily housing project solely for the purpose of permitting location of accessible units above or below the accessible grade level.