Americans were slightly less mobile last year, according to the Chicago Title and Trust Co. The average American home was owned 12 years in 1989, up slightly from an 11.5-year average in 1988.

In its annual study the title insurance company found a collective slowing of sales in the Northeast and Mid-Atlantic states, continued high turnover in the Midwest, very high turnover in the Northwest, a housing comeback in the oil-producing states and a hyperactive market in Nevada.

In the District of Columbia, the average length of ownership increased to 10.9 years in 1989 from 8.9 years in 1988. In Virginia, it was 10.2 years last year, up from 8.8 years in 1988, and in Maryland the length went to 9.4 years in 1989 from 8.5 years in 1988. The national rate generally ranges from 11 to 14 years.

A spokesman for Chicago Title said that homeowner mobility is affected by population changes, economic strength and such urban-rural demographic trends as the age of a state's residents. Economic conditions are expected to keep home sales stagnant over the next few years, Chicago Title said.

Baltimore city officials have agreed to sell a portion of the former Baltimore Colts training camp in Owings Mills, Md., to an operator of discount retail outlets.

The city's Board of Estimates voted last week to sell 38 acres of the training camp site for $4.75 million dollars to Price Co., which is based in San Diego and runs the Price Club outlets.

Price's offer was the highest of five offered to and reviewed by the board. The city government solicited the bids for the property.

The sales price exceeds the $4.6 million the city paid Colts owner Robert Irsay in 1986, after Irsay moved the football team to Indianapolis.

IN THE BUSINESS ... The Evans Co. was named developer of the year by the Northern Virginia Chapter of the National Association of Industrial & Office Parks in its awards presentation to local developers last week. In other categories, Reston Town Center Associates received the prize for Best Office Building Over 150,000 Square Feet for One Fountain Square and the Hazel/Peterson Cos.' Fair Lakes Five was named Best Office Building Under 150,000 Square Feet.

The Charles E. Smith Cos. and the Artery Organization's Arlington Courthouse Plaza was named Best Office Park with greater than 50 percent structured parking; Summit I and II by Centennial Development Corp. was named Best Office Park with less than 50 percent structured parking.

Fairfax Square Retail, Phase I by Metropolitan Partnership Ltd. received the award for Best Special Project. For Best Build-to-Suit Project, Hazel-Peterson won with its Fair Lakes Three. The Mark Winkler Co. won Best Rehab Project for Reston International Center. Northpointe Phase II by Cambridge Development took the award for Best R&D Industrial Park; Cambridge also received the Best Industrial-Warehouse-Distribution Facility award for Gainsford Center and the Best R&D Building award for Southgate Three.

Colonial Village Center Inc. and the Galbreath Co.'s Colonial Place won the award for Best Marketing Package for an Office Building. Metropolitan Partnership Ltd. received Best Marketing Package for an Office Park for its Fairfax Square. Reston Land Corp. received the award for Best Marketing Package for a Special Category for the town of Reston.

NAIOP vice president Philip E. Meany was given the chapter's award for member of the year and three developers -- Hazel-Peterson, the West*Group and the Smith Cos. -- were given the president's award of distinction.

In Virginia, home sales totaled 4,411 in September, down from 5,433 during September 1989, the Virginia Association of Realtors reported. Year to date, 52,101 homes have sold in the state, down from 58,199 during the first nine months of 1989. In Northern Virginia, sales totaled 1,191 in September, up from 1,103 in September 1989 ... Hechinger Co. has announced plans for a affordable housing project in Silver Spring, a part of the low-income housing tax credit program. Burnt Mills Crossing, a 96-unit rental apartment community that is required to offer affordable rents for 15 years, will be built by a joint venture between Hechinger and developer Leon Andris. Rents vary according to tenants' income levels and apartment sizes, and will range between $585 and $805 a month. The maximum allowable income for a family of four is $32,460.

Robert Lewis and Bruce Brownell are planning to develop Stoneleigh Golf & Country Club, an 18-hole golf course in Round Hill in Loudoun County. There are also 140 one- to four-acre residential lots for sale that surround the golf course. The lots are priced between $125,000 and $250,000 ... Contracts signed in September for future construction activity in the District of Columbia totaled $37.56 million in September, down 34 percent from $56.95 million in September 1989, F.W. Dodge Division of McGraw-Hill Inc. reported. Year to date, total contracts signed are down 40 percent, for a total of $513.6 million in the first nine months of the year, compared with $850.2 million during the same period last year ... The Washington D.C. Association of Realtors announced its annual award winners. Richard Brown of the Pacific Institute was named Realtor of the Year; Peter Clute of Pardoe Real Estate was named Distinguished Sales Associate of the Year; Roger Herst of Coldwell Banker received the award for commercial leasing; and Kathleen Kenety of Arnold Bradley Sargent Davy & Chew Inc. received the award for public service.

The Anne Arundel County Office of Administrative Hearings approved Houston-based Friendswood Development Co.'s planned unit development sketch plan for South River Colony. The 1,400-acre development, located at Route 50 and Route 2 near Annapolis, is planned for completion within six to eight years. It is planned to include residential, retail office and recreational developments ... The Magruder Cos. plan to complete construction in the next few months on a new 16,700-square-foot shopping center in Poolesville ... Chevy Chase Pavilion, a new 1 million-square-foot development on Wisconsin Avenue at the Maryland-District line, opened Oct. 17. The three-story mall, topped with eight floors of office space, also includes three floors of underground parking and an entrance to the Friendship Heights Metro Station. The mall is 70 percent leased and 45 percent of the tenants have moved in. The office space is 60 percent leased and 27 percent occupied.

The Washington, D.C., metropolitan real estate market was named one of the 26 "sizzler" housing markets by a Columbus, Ohio-based consultant, the Danter Co., because it says the area's housing shortage makes it a good location for development ... Corporate Real Estate Advisors of McLean announced a merger with the Amend Group of Dallas, which also has offices in Atlanta. The new firm will still be called the Amend Group ... Interstate General Co. L.P. is planning to give away a trip for two to January's Super Bowl game in Tampa in a drawing of real estate sales agents who sign up when showing prospective buyers one of the company's model homes in St. Charles or Westbury ... The National Association of Brick Distributors is planning a study tour of four Eastern European cities to meet with building-industry officials and make contacts for business possibilities ... Market Street Mortgage Corp. of Annandale acquired the Greenbelt office of Mortgage Funding Corp. ... Coscan Homes recently opened models in several condominium and single-family home complexes in Maryland and Virginia. Their new developments include: Scenery Pointe and Manchester Farm in Germantown, Kings Council in Upper Marlboro, Washingtonian Woods in Gaithersburg, Fox Run Estates in Clinton, Jonathan's Trace in Silver Spring and Manorgate II Townhomes in Centreville.

The National Association of the Remodeling Industry is offering free copies of its local directory to consumers to help them locate licensed professionals. For a copy, write, NARI, 808 17th St. NW, Suite 608, Washington, D.C. 20006 ... The Pennsylvania Avenue Development Corp. plans to begin programs testing employees for drug use, requiring contractors to have drug-free workplace programs and denying contracts to individuals convicted of drug-related offenses ... The Greater Baltimore Board of Realtors elected Brandon F. Gaines president for the coming term.

CALENDAR ... The District of Columbia Bar is planning a seminar on "Real Estate Transactions With the Federal Government" Wednesday at the Ramada Renaissance Techworld. For more information, call 202-331-4364 ... The National Building Museum is planning an afternoon symposium on window technologies Thursday at 3 p.m. ... Women in Retail Real Estate is planning a seminar on "Tenant Bankruptcy and Lease Liquidation" Nov. 13 at 6 p.m. at the Bethesda Ramada Inn. Call 202-966-7242 for reservations ... The Washington Building Congress is planning a half-day conference on "Recommendations to Improve the Construction Process" on Nov. 15 at the Mayflower Hotel. For more information, call 202-244-6481 ... The National Housing Rehabilitation Conference, sponsored by HUD and the National Association of Housing & Redevelopment Officials, is planned for Nov. 28 through 30 at the Washington Marriott. For more information, call 703-218-2641 ... The District of Columbia Building Industry Association is planning a dinner meeting called "Where Do We Go From Here?" Nov. 29 at the Washington Vista Hotel. For more information, call 202-966-8665 ... The Institute for Professional and Executive Development Inc. is planning a workshop on "Corporate Investment in Housing Tax Credits," Nov. 29 at the Capital Hilton. For more information, call 202-331-9230.

PERSONNEL FILE ... Snider Brothers, Property Management Inc. of Bethesda promoted Barbara Q. Shea to vice president in charge of the company's condominium and homeowners association department ... Mackintosh Inc. of Frederick named Marilyn Harrington president and broker of record. -- Compiled from staff reports and news services