manhattan’s booming rental market is getting a little bit more inventory as a 58unit luxury building prepares to begin leasing in midtown  the zeckendorf development project at 115 e 55th st between park and lexington avenues is opening just as rents and competition for apartments are expected to peak in the prime leasing months of july and august its units range from onebedrooms with roughly 600 square feet 57 square meters for about 5000 a month to 2500squarefoot fourbedrooms for 35000 the apartments have highend finishes and there are plenty of “small details of old new york” such as a coffered ceiling in the lobby said joshua young an executive vice president at brown harris stevens the brokerage marketing and leasing the units “it has park avenue charm and is a very well thoughtout and planned building”