Earlier quoted context omitted.
Ironically, rent control is exactly why there is so little housing available in SF. Iirc, only 30% of the voting population owns property. So how is it that the rest of us (70%) don't vote to build more? Well, because 3/4 renters are under rent control, and essentially don't care. So only 70%/4 Edit: source: http://www.quora.com/What-percentage-of-San-Francisco-apartm...
If the majority of owners don't wish to personally utilize their property and instead choose to extract rent from it, what exactly are the renters supposed to buy? Owners can apparently force renters to bleed ever more money, but renters can't force a squatting owner to sell, they just have to accept it or, as this letter exemplifies, GTFO.
If you offer to pay at least as much for the building as the landlord would expect to make from renting it out then any rational landlord will sell you the building.
> Owners can apparently force renters to bleed ever more money
If they raise the rent significantly above what typical apartments go for in the area then the tenant will move out and they'll have to spend money to find a new tenant and go without rent in the meantime.
Rental housing is one of the most efficient markets in existence. Landlords have nothing to gain by gouging tenants who will only move across the street to keep paying what they are now, which is why that rarely if ever happens. But when the local market price of housing changes, adjusting rents to meet the market is completely reasonable and natural.