First Potomac Office Closure - Labor Day
In observance of the Labor Day holiday, First Potomac offices will be closed Friday, August 29, 2014, starting at 2pm and on Monday, September 1, 2014. Offices will resume normal business hours on Tuesday, September 2nd, at 8:30am. If you need immediate assistance during this time, please contact the after-hours emergency line at 1-800-818-9487. Thank you.

Roof replacement
Tenants at TenThreeTwenty:

Please be advised we are replacing the 3 lower roofs to the building, beginning September 2nd. The anticipated completion date is September 12th. Kindly be aware of any signs regarding the pedestrian sidewalk outside the first floor entrance next to the walkway to the lakefront. The contractor will have a lift staged outside the building to move materials to and from the roof, and will provide caution notices to those walking by the staging area.

Feel free to contact me if you have any questions.

Doris Perry
Property Manager

Welcome About TenThreeTwenty Operating Instructions Search


Welcome to First Potomac. We're happy to have you as a tenant here at the TenThreeTwenty Building. First Potomac began in 1997 when our founders, Doug Donatelli and Nick Smith, started out with just four properties. First Potomac now encompasses over 10 million square feet of office and business park properties throughout the region.

If you've relocated to our property from outside of the First Potomac portfolio let your previous neighbors know they're welcome here. We're always happy to work with new tenants, especially ones that come to us from trusted sources, like you. Our office space spans Class A, LEED Platinum to business parks located throughout the greater Washington region and we are always just a phone call or email away.

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