The Housing Opportunities Commission of Montgomery County plans to sign an agreement next week with a group of underwriters for a $28.69 million bond issue to provide funds for mortgage loans. The loans will be available for approximately 460 moderately priced new homes in the county to be sold to persons qualifying under income eligibility levels set by HOC. Seventeen developers throughout the county have been approved to build the houses.

Spring Mall Towers, a nine-story office building adjacent to the Springfield Mall, was recently finished. It will be headquarters for United Industries, a minority-owned engineering and management services, and the other half of the $6 million building will be leased.

Michael J. Murray has joined the Donohoe Companies as corporate treasurer. He was formerly vice president of finance of O'Boyle Tank Lines Inc.

The Fred Pritt Corp., a builder, announced that it sold 50 town houses in Crofton Village during early May. Prices begin at $59,900.

The Scarborough Corp. has broken ground for a town house community in Vienna called Country Creek. It is north of Rte. 66 near the intersection of Sutton Road and Blake Lane. Four models will be completed in September. The top price will be $105,000.

The Maryland Association of Realtors will begin its 28th annual convention Thursday at Ocean City, Md. A panel on the home financing outlook to be held Friday morning at the Sheraton Fontainebleau will include loan executives J. Ronald Weismiller, Joseph Bouffard and Thomas Marvel.

Michael W. Seay, 27, assistant vice president and sales manager of W.C. & A.N. Miller Development Co., has earned the Certified Real Estate Brokerage Manager designation from the Realtors National Marketing Institute.

Brummel Manor, a community of 84 condomnium dwellings off Blair Road, NW, has been opened by developers Melvyn Estrin and Bruce Winston. Five models are being shown at 566 Brummel Ct., near the Takoma Park Metro station. Sulton Campbell & Associates designed the one- and two-story cluster houses. Prices begin in the upper $70,000s.

Patricia Mathews is serving a second term as president of the National Society of Professional Resident Managers.

John H. Frederick of Rockville has been elected president of the local Consulting Engineers Council. John C. McGee has been awarded the A. Barry Morris award for excellence in drafting by the CEC chapter.

The Northern Virginia Board of Realtors reported that its members sold 1,662 homes in May for a total of $149 million, down sharply from the 2,623 sales for $213 million in May 1979. For the first five months of this year, total residential sales dropped to 3,094, from 5,153 and total volume from $412 to $276 million.

F. Alden Murray Jr. has been elected president of the area chapter of the American Society of Appraisers. Other offices are Milton McCormick, Harry Farr, Theodore Cooper, Charles Moore and Melville Peters.

The D.C. Builders Association will hold a membership meeting Tuesday evening at the Touchdown Club, where a panel on city politics will include Realtor G.V. Brenneman, attorney Samuel Jackson and Democratic committee chairman Robert Washington.

A new section of town houses is being opened today in Calverton, a suburban Maryland community developed by MCD Holdings Inc. Four models, with prices starting near $70,000, are being shown. The site is on Beltsville Road, reached via the Beltway and Powder Mill Road.

Harvey J. Sorum, Dow Chemical's representative in this area for nine years, has been named to the National Council of the Housing Industry, a group of producers of home building materials affiliated with the National Association of Home Builders.

Pulte Home Corp. is opening a new group of town houses today at Snowden's Mill, where prices begin at $88,000. The site is near the intersection of Old Clumbia Pike and Randolph Road, just west of Rte. 29 in Silver Spring.

Mark A. Moorstein has joined Walker & Dunlop as vice president and manager of the firm's government-insured mortgage loan department. An attorney, Moorstein formerly was with the Department of Housing and Urban Development in Cleveland and Washington.

Carriage Works, a grouping of traditional town houses at North Alfred and Oronoco streets in Old Town Alexandria, includes a landscaped courtyard around which the houses are built. Prices range from $135,5000. Sales are by Golubin & Warwick Inc.