After revealing on the Renovation blog that we are converting our SRO into a 2-family residence, we were contacted off-list by a regular reader who’s also a veteran owner and renovator of Brooklyn brownstones. He advised us strongly to convert to a 3-family instead, citing a higher market value ($50K to $75K higher), greater flexibility down the road, and the prohibitively high cost of trying to change the C of O again at a later date. When we were originally discussing the matter with our code consultant, we were persuaded that the additional costs and code requirements of a 3-family (sprinklers or fire escapes, handicap access) made it less desireable. What do you think? Have any of you faced a similar choice? Does a 3-family really command such a price premium?