The 'original' Penn Station on Seventh Ave between W 31 St and W 33 St was built in 1911 and demolished in 1966 to make way for an office tower and Madison Square Garden. As it turns out, there's a Post office around the corner on 8th Ave between W 31 St and W 33 St. It was built around the same time as the 'original' Penn Station and looks something like it! In fact, they were built to complement each other!
The LIRR tracks and Jersey trains run under the post office so there's plans of turning this fine structure into what Penn Station USED to be like before its destruction. They were talking about doing this since 1992 but I think we'll finally see things happen in the coming years! Although we lost the 'original' Penn Station in 1966, the widowed post office building will help make Penn Station the place it was REALLY meant to be; both for today's generation and all of posterity!