O&S Associates provided design and oversight for the comprehensive restoration of the Belgravia Hotel, a Beaux-Arts historic landmark. The project included the restoration of terracotta masonry, window replacement, and the preservation of the cast iron canopy, earning prestigious awards.

O&S provided a comprehensive façade assessment for the historic Reading Terminal Headhouse in Philadelphia, balancing the needs of historic preservation with functional repairs for the Marriott hotel and convention center entrance.