Real estate developers say the number of such projects is growing , especially in densely populated areas like New York , Chicago and downtown Miami , and in smaller cities like New Rochelle , N.Y. '' As urban land becomes more valuable , '' said Jason Muss , a principal at Muss Development in Forest Hills , N.Y. , '' you are going to find more developers like us trying to build properties that meld residential and retail use , which used to be kept separate . ''