The Old Chicago Main Post Office Redevelopment was an approved project on a lot located along the Chicago River on the southwest side of Downtown Chicago, Illinois to be constructed in phases over a period of one decade that would have included the renovation of the building as well as residential, retail, entertainment and office space. The plan included several towers, the tallest one being a proposed 120-story mixed use twin tower skyscraper to stand about high to the roof, which would have made it the tallest building in the United States, over taller than the Willis Tower, containing office, residential, and hotel space. It would also have included two 60-story residential towers as well as a 40-story hotel. All the buildings in the development were to be connected via a ground-level complex that would have been built over the Chicago River and the Eisenhower Expressway. More specifically, it was exactly one year and nine months after acquiring the post office property from the Postal Service when Davies unveiled his plan for the Post Office on July 21, 2011. The proposal, which involved three other properties besides the 14-story Post Office, was broken down into three phases pending the required $3.5 billion in funding: