A "neighborhood watch" program to reduce thefts and vandalism in residential areas is being sponsored by the Northern Virginia Board of Realtors in conjunction with the National Sheriffs Asscoiation. Students at George Mason University packaged of kits explaining the neighborhood watch." Packets will be delivered by board members to people with houses for sale and to their neighbors. In an unrelated incidents this week, Fairfax Country police arrested a real estate agent who allegedly used his "lock box" key to enter houses all over Northern Virginia and steal property totaling $300,000.

The Preservation Resource Group will hold an all-day seminar June 17th on rehabilitation of old commercial and residential buildings. It will be held at the Alexandria Bicentennial Center. Cost is $19 per person. For information, call 323.1407.

The Consumer Information Institute will hold a seminar on selling houses, with or without brokers, next Saturday at the Marriott Key Bridge. Cost is $35 a person or $50 per couple. For information, call 649-6666.

Grady Management Inc., based in Silver Spring has opened a condominium office division at 12700 Ocean Hwy., Ocean City, Md. Richard Meadows is managing the office.

Applications for apprenticeship training in various building trades may be obtained from the Metropolitan Washington chapter of the Associated Builders & Contractors Inc., 912 Thayer Ave., Silver Spring, between 9 a.m. and 4 p.m. on weekdays.

James W. Rouse & Co. Inc. has arranged $4.9 million in long-term financing with New England Mutual Life Insurance Co. for three industrial buildings being developed by Gibson Warehousing Co.Inc. in the Fleet Industrial Park in the Springfield area of Virginia.

The Brick Institute of America, based in McLean, has published a 24-page booklet describing how solar home heating systems work and also providing examples of solar home designs. A copy of the illustrated booklet is available for $2 from the Brick Insitute, 1750 Old Meadow Rd., McLean 22102.

Pinewood Development Corp. is building single-family houses in the Pinewood Mills subdivision in the Woodbridge area of Prince William Country. Charles Miller, sales manager, said the houses will have gas heat and appliances.

MCD Holdings Inc., a Prince George's Country firm headed by Albert Turner, said it sold 165 houses in the first quarter of 1978. Many sales were in the Kingsford and Kettering communities, the firm said.

Joseph Lane, a communications specialist, has been named training director for the Red Carpetaffiliated real estate office franchises in this area.

Walker & Dunlop Inc. has arranged $6.4 million in construction and permanent finacing for the second Fort Lincoln Senior Village apartment being built with FHA insurance in that new community in Northeast Washington. Forest City Dillon ofCleveland is the builder and Andrew Bryant & Asociates the architect.