Primarily correspondence about the business activities at 380 Madison Avenue. The correspondence deals with the building management, financial matters, provided services, insurance, structure maintenance, corporate issues, and other subjects. Letters to and from Cross & Brown Company portray their administration of the property. Topics discussed in these documents include tenants, leases, collection of rent and tenant charges, maintenance and repair of the building, payment of invoices, broker commissions, utility bills, complaints, Department of Buildings inspections, taxes, supplies, fire safety, reports, employees, and the management agreement and fees. Most of the correspondence about financial matters is with Irving Trust Company regarding the confirmations of purchases for the custody account, service charges, account agreement, signature authorizations, and associated transactions. The rest of the financial communications deal with investments, statements, taxes, and the purchase of corporate office equipment and supplies. Several services were provided to the building's tenants including cleaning, electricity, water, cable television, steam, security, elevators, fire safety systems, air conditioning, paper supplies, and related operations. Their implementation is explained in correspondence with Otis Elevator Company, Consolidated Edison, National Cleaning Contractors, Prudential Building Maintenance, and others. Alongside these letters are service contracts, maintenance information, daily elevator reports, proposals, complaints, Fire Department inspections, violations, staffing records, and repair work documents. The physical condition of the building is also described in communications about repairs, renovations, improvements, and continuing upkeep. Also included in the correspondence are insurance claims for accidents, injuries, workers' compensation, and damage cause by leaks and fire. The insurance papers also have premium payments, disability benefits policy, health care plan brochures, and information on the public plate glass. Interoffice memorandums offer accounts of building operations, employee matters, utilities, insurance coverage, financial conditions, issues concerning tenants, inspections, maintenance, meetings, and the original construction project. There is also corporate related correspondence on a possible merger, sale, legal advice, labor union agreements, commercial travel, and other business activities. In addition to the correspondence, the sub-subseries contains company performance reports, labor reports, mail distribution instructions, magazine subscriptions, and U.S. Census information.