Sydney has the capacity to build a highrise crown casino at the city centre then why can't they hire the same builders to continue building residential 3BDR-4BD

Sydney has the capacity to build a highrise crown casino at the city centre then why can't they hire the same builders to continue building residential 3BDR-4BDR homes in the suburbs which will also allow locals to have children. I believe the pricing of various things involved is insane and not where it should be to allow this to materialise. The rents, insurance, wage bills and capital cost seems to be the major bottlenecks.