Why should an Arena be downtown?

Maybe for obvious reason posted on Thursday, February 11th but consider this ...

- US Air Arena was located where? But where did they build the Verizon Center?


- RFK was located where?  But FedEx field was built where?  Now there is talk about building another stadium where?

- Where is Washington Nationals stadium located?

The perception is that Washington, DC has figured out that arena and stadiums need to be in the heart of the City to be most successful.