Mariner Commercial Properties, Inc. was formed in 1996 as the investment and development arm of Mahoney Realty Group, Inc., a full service commercial brokerage and services firm, with both firms based in Ardmore, Pennsylvania. Mariner began life as a developer of suburban office buildings and during this phase completed a variety projects including ground up “new-builds”, a brownfield redevelopment, in-fill adaptive reuse of abandoned and obsolete buildings, and several major renovation and re-positioning projects. Mariner continues to own and operate all of its original development properties.

By 2000, seeing a unique opportunity to enter a segment which was just beginning to evolve, Mariner quickly changed its focus to Smart Growth Development, with an emphasis on urban in-fill mixed-use development in high barrier to entry markets in Philadelphia, and throughout the Delaware Valley and Southern New Jersey. In 2005, Mariner expanded its mission to include a commitment to sustainable architecture development as defined by the US Green Building Council.