With its double-height doorway and tall arched window providing glimpses of a landscaped central garden courtyard, 1088 Park is one of the avenue's few residences with a truly grand entryway. The limestone and gray-brick building, designed by Mott B. Schmitt and completed in 1925, remains one of the most prestigious addresses in the Carnegie Hill section of the Upper East Side. The 15-story building's 84 apartments overlook the quarter-acre garden courtyard, and additional perks at this pre-war co-op include a full-time doorman, a gym,