The foreclosure lawsuit of the historic Union Trust Building in Downtown Pittsburg has pitted a big California bank against local contractors. The building was constructed in 1916 by Henry Clay Frick, and recently completed extensive renovations. The bank, California National Bank of Long Beach, filed the lawsuit because about 10 different contractors filed $3.57 in mechanics liens. The bank claims the Pennsylvania mechanics lien filings are a breach of the loan agreement with the owner of the Union Trust Building. The contractors are hoping that the filing of the mechanics liens and the resulting foreclosure suit will result in the owner finally paying them what is is owed for the work they performed on the property.