An entity affiliated with Alterra Property Group has sold a commercial condominium housing a new Giant Heirloom at 801 Market St. in Philadelphia for $21.63 million.  The entity, 801 Market Partners LLC, sold the 32,000-square-foot space to Realty Income Trust of San Diego (NYSE: O).  Alterra, a developer, bought the commercial condo from PREIT for… Read more »