Holden Building Co. is completing the renovations of the Triton Building in Greensboro at what will be the future home of The Housing Hub.  Members of the Housing Hub signed leases on Aug. 11 for what will be the headquarters for six nonprofit organizations that will operate from this central headquarters at 1031 Summit Ave. in Greensboro.  The City of Greensboro gave $250,000 to match an equal amount provided by the Community Foundation of Greater Greensboro to advance this project.  The hub brings together many of the nonprofits that work on different facets of housing assistance to make a one-stop shop for those in need of safe, affordable housing.