10. Structures indistinguishable as being of their own time (A new building or addition should seek to contribute to the resource’s future evolution just as the existing building shows its past development.)
45. Avoid “Jarring” Preservation philosophy suggests that successful additions be sufficiently distinct from the buildings to which they are being added to avoid confusion or false history. But the distinction need not be jarring; indeed, compatibility often demands otherwise.
48. Corcoran Museum of Art, Washington D.C. In approving the wildly modern design for the Corcoran gallery addition, the Historic Preservation Division staff report noted that, “[W]hile the historic preservation guidelines stress … compatibility … it does not necessarily serve the purposes of preservation (to say nothing of design) to oppose attempts at very fresh, contemporary architectural expressions in the urban environment, especially when they can read from the exterior as essentially separate structures … Adding a watered-down classical background addition would be a legitimate alternative, but the present proposal is arguably as good an option, and undoubtedly a more interesting one.” In Re 500 17th Street, NW, (Corcoran Gallery) H.P.A. No. 02-284 (Sept. 19, 2002).