Principally documents about the construction of the twenty -five-story office building at 300 Park Avenue. Uris Brothers, Inc. was engaged as the general contractor to erect the structure according to the plans and specifications prepared by Emery Roth & Sons. The sub-subseries contains correspondence, work orders, agreements, instructions to bidders, specifications, drawing transmittal sheets, worksheets, financial records, reports, schedules, drawings, and other materials. These documents describe the construction of electrical, HVAC, plumbing, lighting, telephone, vertical conveyor systems as well as the assembly of walls, roofing, windows, floors, ceilings, elevators, doors, store fronts, toilets, hardware, and signs. They detail subcontractor's work on the acoustics, brick, cement finish, concrete slabs, fireproofing, glazing, granite, gunite, insulation, iron, marble, masonry, metal furring and lathing, ornamental metal, painting, plastering, steel, terrazzo, tile, Venetian blinds, waterproofing, woodwork, and a plaque commemorating the Columbia School of Mines. In addition, there are records about the survey, demolition, and excavation of the existing residential property.