Greenhouse Effect Coffeeshop is located directly on Nieuwmarkt Square. This is among the top tourist spots in the city, dense with both historic buildings and modern businesses. Greenhouse Effect is actually one of several coffeeshops directly on the square, which is arguably prime real estate for such businesses. This shop was formerly located on Warmoesstraat, and was attached to a small hotel. It was a popular place. With the changing of regulations in the red light district, however, the coffeeshop was forced to move. In the Nieuwmarkt, it is now taking up the old space of Hill Street Blues coffeeshop. The old hotel in the RLD, unfortunately, is now closed. Incidentally, Greenhouse Effect is not affiliated with the Green House chain of coffeeshops in Amsterdam.