None of these are particularly new questions. There are federal buildings and federal leased space in every major city across the US. The feds have their own Federal Protective Service Police that respond to incidents on federal property in major cities nation wide. Fire/EMS is usually handled by the locals.
The core national mall area is already protected by US Park Police, it would be possible to create a core DC area as a national park and return the rest of all land to the states. Federal buildings on land returned to the states would be treated like any other federal building in a state. There are plenty of federal buildings in NoVa and Maryland already.
The core national mall area is already protected by US Park Police, it would be possible to create a core DC area as a national park and return the rest of all land to the states. Federal buildings on land returned to the states would be treated like any other federal building in a state. There are plenty of federal buildings in NoVa and Maryland already.