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THE GROTTO Tourism and Conventions - Convention Centers NE 85th and Sandy Boulevard Portland, OR 97294-0008 Phone: 503-254-7371 Map it using The Grotto, an oasis in the city, is a peaceful 62 acre retreat located minutes from downtown and the Portland International Airport. Set among towering firs, colorful rhododendrons and other native Pacific Northwest flora, The Grotto Conference Center provides a unique setting for retreats, workshops, seminars, conferences, meetings, receptions, and banquets.