You edited your post quite drastically. I'm responding to the original:

> Why do you insist it be the city's services and not the federal govenment's services? Where in San Francisco do suggest we house the nation's 643,000 homeless if the problem isn't solved at a national level?

Is it really only 643000? San Francisco's a city of ~800000 and could probably handle a 75% increase with a bit of high density construction. Sounds like such an easy problem to solve financially speaking. Why hasn't it been done already?