Off-Street Parking Requirements for the C-O Rosslyn District

In the Arlington County C-O Rosslyn: Mixed Use Rosslyn district, residential projects are required to provide one off-street parking space per dwelling unit, while hotel developments must provide 0.7 spaces per guest room. For office and retail uses, the parking requirement ranges from one space per 530 square feet to one space per 1,000 square feet of gross floor area (GFA), with the exact ratio contingent upon the adequacy of the project's Transportation Demand Management (TDM) plan. All parking for these developments must be located either below grade or within the structure housing the use.

Required Parking Ratios

Off-street parking in the C-O Rosslyn district is governed by specific site development standards that may be modified by the Arlington County Board through the site plan approval process. The standard requirements are as follows:

Use Category	Parking Requirement
Multi-family Residential	1.0 space per dwelling unit
Hotel	0.7 spaces per guest room and dwelling unit
Office, Retail, and Service Commercial	1.0 space per 530 sq. ft. to 1,000 sq. ft. of GFA*

*The specific ratio within this range is determined based on the adequacy of the project's Transportation Demand Management (TDM) plan in addressing parking needs [§7.15.5.A.1].

Location and Structural Requirements

Arlington County mandates specific placement standards for off-street parking within the C-O Rosslyn district to maintain the urban character and pedestrian experience of the Rosslyn Sector Plan area:

Internal Placement

All parking provided for residential or commercial uses in the C-O Rosslyn district must be located below grade or within the structure that houses the use to which the parking is appurtenant [§7.15.5.A.2].

Short-Term Parking

For commercial tenant retailers, the developer must provide short-term, convenient parking for customers. These spaces must be available during all hours that the business premises are open to the general public [§7.15.5.A.2].

Transportation Demand Management (TDM)

A critical component of parking regulation in the C-O Rosslyn district is the TDM plan. Any project seeking site plan approval from Arlington County must have an approved TDM plan. This plan serves as the primary justification for the parking ratios assigned to the office and retail components of a development, specifically helping to determine where a project falls within the 1-per-530 to 1-per-1,000 square foot range [§7.15.5.A.2].

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