"More than 280,000 units — nearly half of Manhattan’s apartment stock — is rent-regulated in some fashion."

"These apartments are either godsends to those who occupy them, or daggers that twist in the hearts of everyone else, left to pay market rate or compete for the borough’s remaining vacancies — 2.8 percent of the housing stock, as measured in 2011."

From an article about what counts as "middle class" in Manhattan. It's not so much an amount of money you need to make as it is when you got into the real estate market.