[LA21st]

Yes, Rosslyn is a office district/skyline. But nobody refers to them as downtown, as is the same for any city. Century City in LA is never called downtown because it has highrises.

For DC, downtown will always be downtown DC for most DMV residents. I've never heard of this confusion you've speak of for the metro area.

I 'm born and raised in NOVA. There are multiple "downtowns" in the DC area, but that's true for many cities at this point.