To save on costs for office building remodeling projects and to cut down on the number of spare parts required; most buildings .

it made it so people could only live i certain areas.

answer; buyer guide;

answerchemical property;

for submitting your question to

the answer to your question is : c) a government agency or homeowner

due to his line of work, he is most likely employed by a government agency or homeowner due to the other choices not being logical haha.