A developer based in suburban Philadelphia’s Main Line is teaming up to help The Shooshan Co. build a new office building along the Rosslyn-Ballston Corridor’s Wilson Boulevard.

Shooshan has formed a joint venture partnership with Radnor-based Brandywine Realty Trust to develop 4040 Wilson Blvd., a 20-story building that will be the last addition to Shooshan’s Liberty Center mixed-use project. Brandywine is kicking in $36 million as part of the deal, according to Brandywine.