This series is comprised of mediations, arbitrations, and other documents created between 1903-1995. Arbitrations titles are coded according to the listing of decisions in the Handbook of the Building Trades Employers Association of the City of New York (commonly known as the "Green Book").

This series was added to the collection in 2013 and contains mediation and arbitration files created between 1989 and 2011. These "arbitrations" contain bound transcripts, many of which are accompanied by three ring binders of official evidence. Mediation files are less formal and contain a wide range of documentation including, court papers, correspondence, and evidence relating to each suit. Files in this series labeled "mediation" may also contain arbitrations, as many disputes initially intended to be resolved as mediations ultimately ended in arbitration.

The majority of the files were created after 2000 and have been numbered in a way that reflects the date in which proceedings begun. Files created prior to 2000, however, are dated but lack numeration.

Photographs, as well as photocopies with captions, of the Board of Delegates and Board of Governors of the Building Trades Employers Association.

Building Trades Employers Association (BTEA) is affiliated with 28 trade union contractor associations, representing the 1,700 construction managers, general contractors and specialty subcontractor firms in New York City, who employ 125,000 people. Members range in size from multi-billion dollar internationally recognized firms to small and mid-sized specialty trade contracting firms. The BTEA promotes safety, skill training, professional standards, and works to strengthen the economic vitality and social fabric of New York City. The website contains event listings, reports and publications, including the BTEA News, training and committee information, bargaining agreement schedules, and information on their current projects.