We need to evaluate the suitability of this building for use as a school.

suitability 是形容词 suitable（适合的）加上名词后缀 -ity 构成的名词形式，表示"适合性"或"适用性"。suitable 本身由词根 suit（适合）加形容词后缀 -able（能够...的）构成。