Demand for office space in the Washington region is among the top in the country, with asking rent in the District now the highest in the nation, according to a new report, but slowed development has skewed demand.

The District reached its highest office demand in 10 years for the three months ending Sept. 30, and suburban Maryland posted nearly double its historical rate, according to a commercial real estate report from Cassidy Turley. Northern Virginia’s demand was equal to its 10-year quarterly average.