In my opinion, ExNYer is exactly right.
Price controls of all types rarely work as intended and often produce very destructive adverse consequences. Rent control as applied in cities like New York is no exception, and over the long run actually hurts many of the people it purports to help.
But while it's certainly part of the picture, this isn't just about making way for new construction. In instances where that's uneconomic, it's important to properly maintain existing apartment units, and it's pretty hard for landlords to do that if cash flow from operations never allows refinancing out enough equity to rehab units.
An apartment unit is not something that pays dividends virtually forever, and never needs attention. If you want to see a complex appreciate in value over time (or, for that matter, even maintain its value), it is
critically important to rehab interiors every few years. This includes flooring, cabinets, countertops, plumbing fixtures, paint, wallpaper, window blinds, etc. If the landlord fails to do this, the property will deteriorate over time and eventually become virtually uninhabitable.
Although there are many types of loan products available, a typical multi-family loan is due in 10 years with 30-year amortization. Smart owners establish reserves for unit rehabs during the loan period, as well as plan to do substantial upgrades when it's time to refinance, or when the property's cash flow allows placing a second.
Rent controls make all of that very difficult, so units tend to go for very long periods of time without attention and maintenance, and the housing stock simply deteriorates. The net effect is that this ends up being bad for everyone, including those who were intended to be the beneficiaries of the policies.
That's why it's far better to simply give vouchers to low-income tenants, who then will have a better chance of living in a decently maintained place.
And, yes, San Francisco suffers from the same malady.
Speaking of unintended consequences, I came across this just about a year ago:
http://www.nytimes.com/2012/02/17/us...sequences.html
Not exactly a wonderful progressive vision, is it?