Solving the homelessness is not feasible by merely raising taxes. In particular, CA state government does not need more money, the budget is large enough. The issue is what the money is spent, which is absolutely squat.
Truth is, government institutions in particular are pretty poor at allocating funds efficiently. Look at the Federal budget and just how large military spending is. We could cut the budget massively, and still have the largest military budget in the world and plenty of cash to use towards funding affordable housing and then some. Don't tax poor households more, otherwise the vicious cycle continues. Taxes in SoCal are already appropriately high, use what money you have now with more financial responsibility.
What we need is smarter leaders and public officials.
EDIT: I'll provide an example. I have a friend who works as a lifeguard at a public pool. He makes between $13-15 per hour. Perhaps an unpopular opinion, but one he and myself share, he is ridiculously overpaid. First off, the cost of living in my area is lower than the US average (though I'm aware of flaws in those statistics). He usually has plenty of free time on the job, as the pool is rarely used during any period that isn't summer, and works even during the Winter! Even in the Summer, the pool is rarely if ever full. Now, I'm not saying that minimum wage is appropriate in this case, that's too damn low. But little justification for making so much.
Now an argument I expect is that this creates job, people should be paid more, etc etc. I agree, but in a world riddled with scarcity, you have to budget.
Of course, you could just raise taxes and be done with it. This doesn't solve the inefficiency issue, though.
State Rep Weiner wants to severely limit the ability of local municipalities to limit new housing construction. It would be a massive step towards reducing the wealth of upper middle class homeowners and redistribute it to poor renters. When housing prices go down, more people can afford houses.
This appears to be a solid plan, since gentrification is certainly one of the driving forces in rising housing prices. I see it in my home town and it depresses me greatly.