You can't build an apartment without money.  Money is provided by people who want to make money and by  lenders who insist on being paid back.  If you can't rent the apartments for enough to pay back the lender, they will not get built.

The person who might have built an apartment building will do something else with that money....build a hotel or a mall or something else that can make enough money to both pay back the loan and give the person risking their own money in the project something for doing anything in the first place.