The seeds of a new building on Van Brunt Street were hardly planted before the DOB hit the project with a stop work order. But construction’s once again resumed at this site a block from Fairway, which is slated to be a greenhouse and three-story building for the Chelsea Garden Center, which started doing business in Red Hook this past spring. This can’t be good news for nearby Liberty Sunset and the already endangered Gowanus Nursery, can it? GMAP