Shelters and housing

Here are some shocking stats: 

• New York City spends $750,000,000 annually operating emergency shelters for the homeless.
• New York City spends over $2 billion annually on all services for its homeless population.
• It is reported that Dallas spends $50,000,000 on its homeless population--I have a hunch that number is low when we factor in all costs associated with the homeless in our community.

Quesiton:  How many permanent homes, complete with supportive services, could be developed annually if major urban centers like New York City and Dallas devoted just half of the current costs associated with serving the homeless to that end? 

Just wondering.