Arlington County, VA · Arlington County Zoning Ordinance (ACZO)
C-O Rosslyn is the Mixed Use Rosslyn district covering Arlington's highest-density corridor (ACZO §7.15). By-right: 35 ft height. By site plan: FAR up to 3.8 for commercial and up to 4.8 for residential/hotel uses, with height governed by the Rosslyn Sector Plan and County Board approval.
Development standards in C-O-ROSS
We don't hold published dimensional standards for this zone yet — see the ordinance link below for the authoritative table.
Permitted uses in C-O-ROSS
AllowedOffice
AllowedRetail (Ground Floor)
ConditionalHotel Site plan approval required (ACZO §7.15)
ConditionalMulti-Family Residential Site plan approval required; FAR up to 4.8 (ACZO §7.15)
AllowedSTR - Short-Term Rentals By-right (P) in the ACZO accessory use tables, subject to an accessory homestay permit issued by the zoning administrator (ACZO §12.9.12). Host must be the primary resident and present during the guest stay. Entire-home rentals (host absent) are not permitted.
"Conditional" means the use generally requires a public hearing or special-exception approval — a very different timeline and risk profile from a by-right permit.
This is the zone. What about the parcel?
Zone rules are the starting point — the answer for a specific property also depends on lot
size, overlays, existing improvements and site conditions. Run a free address lookup to see
what applies to one property.
Standards as recorded by ZoneScore: Arlington County Zoning Ordinance (ACZO), Effective June 13, 2026
Values are read from the Arlington County Zoning Ordinance (ACZO). Where a district allows more density through site plan approval than by right, both are shown -- they are very different entitlement paths.