a—Encourage the erection of proper types of dwellings;
b—Secure their proper maintenance and management;
c—Prevent the erection of unfit buildings;
d—Bring about a reasonable and practical improvement of the older
buildings;
e—Secure reasonable, scientific and economical building laws.
7. To aid in defending such laws when enacted and in correcting and
amending them from time to time to suit changing conditions.