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 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.

Since 2016, O&S has provided architectural and engineering services for 1199 Housing Corp., a Mitchell-Lama cooperative, delivering façade and structural repairs, site work, and comprehensive compliance support under NYC HDC and HPD jurisdiction.