WASHINGTON, DC—The proposed addition to the CarnegieLibrary in Mount Vernon Square that would house the newhome of the International Spy Museum could bedelayed due to design concerns raised by the D.C. HistoricPreservation Office.

The project “continues to raise a number of substantialpreservation concerns that warrant further study,” according tostaff of the Historic Preservation Office. Those concerns weredetailed in a report given to the Historic Preservation ReviewBoard before is session last Thursday, according to the WashingtonBusiness Journal.

The renovation would add 65,000 square feet, doubling thelibrary's usable space, with two new pavilions and a build-out ofbelow-grade space. Staff of the Historic Preservation Office saythe design as is would reduce open space in Mount Vernon Square andobstruct the view of the original library building. In its report,staff recommended changes in the design to improve views from thesoutheastern and southwestern sides of the building.