Fendall had several land holdings. One of these land ownings was named "Cool Spring Manor" or "Cold Springs Manor". This estate was located on the west side of the Patuxent River in Mt. Calvert Hundred, Calvert Co., Maryland, which is now part of Patuxent Hundred, Prince George's Co., Maryland, near the present day University of Maryland, College Park campus. It included 1050 acres (4.2 km²). Josias obtained this property on July 2, 1649 for ""good faithful services"", and it was laid out May 27, 1657, and granted September 25, 1658.