Would you know a store/nursery in New York City for stoneware or cement rectangular planters? Since these planters are for the front exterior large window ledges of a brownstone in Brooklyn, I am looking for planters in a classic design ( e.g., fluted, bas relief, etc). I would also consider planters in faux terracotta/cement, as long as it is not noticeable that they are fakes.
I would first suggest the new Chelsea Garden Center location out in Red Hook, Brooklyn. The address is 444 Van Brunt Street, (adjacent to Fairway), Red Hook, Brooklyn, 11231. A coworker of mine who lives in Brooklyn said that she found a very large selection of planters there last time she went by. In addition, if you are a member of The Horticultural Society of New York you can present your membership card for a 10% discount on your purchase(s). The other Chelsea Garden Center location is at 580 11th Avenue at 44th Street here in Manhattan, but again, Red Hook should have an equal or better selection.
Otherwise here in Manhattan I might send you to 28th Street to the flower district. Jamali Gardens (149 W. 28th) between 6th and 7th Avenues has a number of large planters that are reasonably priced, but they might not be as decorative as you’d like. There are other shops on 28th that sell large planters, but I fear most of them now only sell wholesale.