I just got back from a mini trip to Philadelphia, wherein I visited 21 offices. I have time just for a short entry:
The Philadelphia Main Post Office has moved, from across the street from the 30th Street Train Station (where there's a post office station, incidentally), kitty corner a couple of blocks away. The windows and carriers are in the new building, while the district offices and processing have been moved to another facility, further away. The old post office (below) is now being renovated for use by the IRS.
Here's a view of the new MPO:
One nice thing is that two post offices in Philadelphia are located INSIDE large train stations -- namely the 30th Street Station and Penn Center. I think that's a great idea that should be applied more frequently.