CLUE: A LANDMARK MODERNIST HOUSE WAS FAMOUS FOR ITS RETRACTABLE LIVING ROOM WINDOWS, WHERE ALTERNATING GLASS PANELS COULD SINK INTO THE BASEMENT TO GIVE THE LIVING ROOM A SENSE OF BEING OUTDOORS. THE RESIDENCE, LONG IN DISREPAIR, HAS RECENTLY BEEN RENOVATED.

The answer to the March issue's Guees the Architect is ALBERT KAHN ASSOCIATES. After the Packard Automotive Plant opened in 1903 in Detroit, Kahn came up with a reinforced-concrete structural system for Building No. 10 that proved to be a pioneering technique for U.S. factories. The Packard Plant hasn't been operational since the late 1990's, but the same firm is working with developer Fernando Palazuelo to convert the former factory to mixed uses.