O&S Associates has conducted extensive assessments and repairs for University of Pennsylvania garages, including visual surveys, acoustic testing, and providing comprehensive reports with repair recommendations and cost estimates for future work.

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 structural, mechanical, and electrical design for the Pittsburgh Technology Center parking garage, integrating solar panels and sustainable features to meet Parksmart Silver standards and support the URA redevelopment plan.

O&S provided a comprehensive ventilation upgrade for 2601 Parkway, including the installation of energy-efficient make-up air units and natural gas heating to address mechanical code violations and improve air quality.

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.

O&S designed and managed the roof replacement at Bayard Taylor School, incorporating EPDM and metal roofing along with comprehensive building repairs to preserve this historic school structure.

O&S developed a 10-year master plan for the Philadelphia Parking Authority, providing engineering services for the assessment, restoration, and renewal of parking garages at Philadelphia International Airport.

O&S performed façade restoration and repairs on the historic Ritz-Carlton Philadelphia, restoring its marble veneer and glazing in accordance with preservation standards set by the Philadelphia Historic Commission.