In 1939 Trinity Church transferred to the Diocese of Newark title to the land on Rector Street upon which its parish house was situated. The parish house was razed and the new Diocesan House was built in 1940.
The decision to build a Diocesan House in Newark on the property where Trinity parish house stood made the relationship between the Church and the Diocese closer and was a stage in the evolution of Trinity from parish to Cathedral. The new building was named Cathedral House and was dedicated on Trinity Sunday, 1941.
Cathedral House, located at 24 Rector Street, served as the diocesan headquarters from 1941 until 1997. The building provided offices for the Bishop and diocesan staff and for the Rector of Trinity and the parish staff.
In the mid 1990s, the Trustees of the Episcopal Fund and Diocesan Properties of the Diocese of Newark entered into an agreement with the New Jersey Economic Development Authority. The agreement provided for the Episcopal Diocese of Newark to convey to the Economic Development Authority two parcels of land, one containing the building known as Cathedral House in exchange for another parcel known as the Chancery property. The Chancery property formerly housed the Roman Catholic Archdiocesan offices.
The building has five floors with a small cupola on the roof. The first floor houses the Chapel. Some of the fittings from the chapel in 24 Rector Street were used in the new chapel.
The Diocese of Newark moved its administrative offices and staff into the renovated building in early 1997. The building located at 31 Mulberry Street in Newark is known as Episcopal House.