The Gerald Hines development corporation, based in Houston, has announced that it is part of a consortium that has reached an agreement with the Peoples Republic of China to develop a 40-acre site in downtown Beijing (Peking). The multi-use Complex will include office and residential space, a hotel and convention facilities. Other members of the consortium are Chase Manhattan Corp., Kaiser Engineers Inc. and Turner International.

Nearing completion on a 2.2-acre site at Connecticut Avenue and Viers Mill Road in Wheaton is a 32-unit condominium office park being developed by a group headed by Albert Small, Hermen Greenberg, Ralph Ochsman and Morton Funger. The Connecticut Belair Medical Park was designed by Cohen and Haft, Holtz, Kerxton and Associates.

H.G. Smithy Co. has announced arrangement of a $10 million mortgage through Travelers Insurance Co. for a seven-story office building at 1555 Wilson Blvd., Rosslyn. Gerald J. Miller is the developer of the building, which will have 148,000 square feet of space.

Realtor Ernest R. Shriver of Emmitsburg, Md., has opened a new section of three- to five-acre lots at Fair Field Farms, between Emmitsburg and Ski Liberty (formerly the Charnita development). Lots are priced from $13,000 to $17,000

Peter G. Miller, who writes a realty column for this section, has opened a discount brokerage firm at 1629 K St. Nw. He will work on a variable commission schedule.

Century 21 Real Estate Corp. of Virginia has opened a relocation center at 7980 Gallows Rd., Vienna., to serve families moving into and out of the Washington-Baltimore area. CAPTION: Picture, UNDER WAY-Construction has begun on this six-story Metroplex Building at the New Carrollton Metro station. Designed by Arthur Cotton Moore, it is being developed by Landmark Associates.