The other key factor involves the specific utilitarian needs of the community and the relative costs and benefits of each alternative in light of those needs. For example, if the need is mainly for more office space, then an architecturally appropriate add-on or annex might serve just as well as a new building. On the other hand, an expensive retrofit may not be worthwhile if no amount of retrofitting would permit it to serve the desired function- Moreover, retrofitting might undermine the historic value of the old building by altering its aesthetic or architectural integrity.
In sum, neither modernization for its own sake nor indiscriminate preservation of old buildings should guide decisions in the controversies at issue. Instead, decisions should be made on a case-by-case basis) considering historic value, community need, and the comparative costs and benefits of each alternative
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