Psah Thmei is known in English as the Central Market, although it's name actually translates as "New Market". It was built on what was previously a lake. In one of the aerial views a huge empty lot can be seen where it now stands. I would presume this picture was taken around 1935 when construction started. It was completed in 1937, and has just recently had an extensive refurbishment. It has a quite unique art-deco style, and was built in a way that makes as much use of natural ventilation as possible. In some views it looks like a spaceship.