The dispute began when 600 Associates LLC, 600 East 156th Street Housing Development Fund Corporation, and 600 East 156th Street LIHTC, LLC – collectively the owners of 600 East 156th Street – contracted Mega Contracting Group, LLC to perform construction work. Mega, in turn, subcontracted with Allen Blvd Interiors, which then subcontracted part of its work to Len & Mar Drywall Corp. Len & Mar held an insurance policy with Illinois Union Insurance Company.