Property taxes in California are miniscule. Mortgages are only as high as they are because people assume they can extract ridiculous rents from tenants, so this is a self-made problem that should go away with sufficiently stringent rent control. The other bills do not vary significantly enough from city to city to justify the absurd rent differences between them.

So no, I'm not assuming anything of the sort. Beyond that, landlords are extremely notorious for spending much less money on repairs than they should and saddling their tenants with the bills.