[Diogenesis]

Possibly relevant Mosque is here:

Dar Al-Hijra
3159 Row St
Falls Church, Va.

Map is here:

[Diogenesis]

shooting:

possible hideaway:

[Spirited]

Home Depot on your map is UP Rt 7 to the first right hand street which goes through to ARlington Blvd and left just before the Blvd on a small road that parallels it.
I think (?) the name of that unamed street on your map is Patrick Henry Dr.

It is what I would call "spitting distance".