Answer:
The answers are:
A) The quantity supplied of office buildings will decrease.
B) Both the market wage will fall and the equilibrium quantity of labor services will fall.
Explanation:
Price ceilings will always decrease the quantity supplied of the products or services that are offered in a market. No matter if the price is imposed for chocolate, cars, rent control, etc, quantity supplied always lowers since the price ceiling is set below the equilibrium price.
Since the price of rental offices will fall, the costs of office buildings will be adjusted, so logically the wages of custodial workers will decrease. Since the wages of custodial workers decrease, then the quantity supplied of custodial labor will also decrease.