PLEASE NOTE: Observatory is part of the Proteus Gowanus art complex. We are accessed by entering and walking through Proteus Gowanus gallery.
R train to Union Street in Brooklyn: Walk two long blocks on Union (towards the Gowanus Canal) to Nevins Street. 543 Union Street is the large red brick building on right. Go right on Nevins and left down alley through large black gates. Gallery is the second door on the left.
F or G train to Carroll Street: Walk one block to Union. Turn right, walk two long blocks on Union towards the Gowanus Canal, cross the bridge, take left on Nevins, go down the alley to the second door on the left.