In my case the tax deductions make it effectively $500/mo cheaper than renting a comparable apartment and the yearly coop fee increases are less than the yearly

In my case the tax deductions make it effectively $500/mo cheaper than renting a comparable apartment and the yearly coop fee increases are less than the yearly increases in rent. Doing some real quick math, I think, ignoring appreciation, its roughly an 8% ROI on the money tied up in the downpayment.