Consists of correspondence, corporate records, management agreements, service and maintenance contracts, construction documents, and other materials related to the construction and operation of 300 Park Avenue. These items describe administrative activities, building management operations, structural maintenance, local law compliance, lease discussions, inspections, and the initial construction of the office building. The correspondence addresses most of these subjects, particularly dealings with building management firms, potential commercial tenants, contractors, city inspectors, service providers, New York Central Railroad, and the residents of the original apartment house at 300 Park Avenue. In accordance with their rights to easement areas, New York Central Railroad wrote to the Urises with their approvals or modifications to the plans and specifications for the new twenty-five-story building and demolition work. Letters between the Uris office, residential tenants, and apartment management company depict the discussions and final agreement concerning relocation of those living in the apartments intended for destruction. In the corporate records, there are appraisals, certificates of title, employee authorizations, business certificates, deeds, insurance papers, purchase statements, and documents about changes to the corporate entities controlling the property. Agreements with Douglas L. Elliman & Co., Cross & Brown Company, and Abrams Benisch Riker, Inc. illustrate the management and leasing services provided by each firm as well as the fees charged. The service contracts with National Cleaning Contractors, Inc., Prudential Building Maintenance, Consolidated Edison, Autocall Metro Inc., Benjamin Harkavy, Lansdell Protective Agency, Inc., Spaeth Design, Tele Dynamics, Walsh Associates, Ltd., and others portray the everyday upkeep of the building. These agreements and supporting documentation demonstrate the cleaning services, landscaping, utilities, elevator service, security, waste removal, light replacements, exterminating services, decorations, coffee service, window washing, and other maintenance issues at 300 Park Avenue. Alongside these service contracts are agreements with contractors, including Arch Electric Inc., Compliance Management, Inc. (CMI), Consolidated Environmental Services, Inc., Jerard Offen Associates, Inc., Manhattan Cooling Towers, Inc., Millar Elevator Industries, Inc., Remco Maintenance Corporation, and Rosenwach Tank Co. Inc., for repairs and renovations on the building. They explain electrical work, asbestos removal, lobby wall repairs, passenger elevator improvements, curtain wall refinishing, water tank replacement, window repairs, and the installation of a new cooling tower. Also included are records regarding the labor and materials needed to fulfill local law requirements for fire safety systems, sprinklers, emergency lighting, elevator recall, anti-bombing measures, communication systems, and access signage. In addition to the contracts about the engineering and construction services required for compliance, there is correspondence and other materials about the Local Law 5 provisions, New York City Department of Building permits, inspections, and violations. Besides these agreements regarding the property's upkeep, there are records pertaining to the original building construction. A building contract, wall agreement, easement agreements with New York Central Railroad, floor plans of the apartment house, and lists of residential tenants reveal a few of the issues surrounding the project. Finally, the sub-subseries also contains a certificate of occupancy, proposed leases, projected financial statements, schedule of leases, equipment information, studies, publicity, and reports of building inspections for condition, repairs, and code compliance.