486 A.2d 1061 Joseph Lebovitz and Fay Lebovitz, his wife v. The Zoning Board of Adjustment of the City of Pittsburgh. The City of Pittsburgh, Appellant. Commonwealth Court of Pennsylvania.Argued November 15, 1984 January 25, 1985. Zoning — Vested right — Variance by estoppel — Scope of appellate review. 1. Mere delay in municipal enforcement […]