Recent residential transactions in the District, recorded by Rufus S. Lusk & Son. Inc.: Former Washingtonian magazine publisher Laughlin Phillips and his wife, Jennifer, bought the Georgetown residence of Janet Auchincloss Morris at 3044 O St. NW for $1.1 million . . . TV newsman Sander Vanocur and his wife, Edith, sold their house at 3155 Highland Pl. NW for $650,000 to Realtor-banker Jeffrey Cohen and his wife, Frances.

The Gude-Piccard Partnership has purchased 8.2 acres on Gude and Piccard drives in Rockville for $800,000 from the Fields Road Partnership. pAn office building will be constructed for Calculon Corp., according to Julien J. Studley Inc., which handled the transaction.

Royal Properties Inc. has opened a Century 21 franchise office at 1445 Dolley Madison Blvd., McLean. Renee Miller is the manager.

The Metropolitan Washington Real Estate Exchangors will sponsor a seminar on creative financing at 9 a.m. Thursday at the Ramada Inn at Tysons Corner. Information is available at 261-2224.

The Montgomery County Board of Realtors will hold free seminars next week on buying and selling homes, financing and alternative financing. The seminars, all beginning at 7 p.m., will be held Monday at Montgomery Blair High School, Tuesday at Gaithersburg High School, Wednesday at Robert Peary High School, Thursday at Parkland Junior High School and Friday at Sherwood High School. The public is invited.

Daisy Tallirco, national president of the Women's Council of Realtors, will be honored by the local chapter at a dinner Friday. Kenneth J. Luchs, president of the Washington Board of Realtors, will be the keynote speaker at a meeting of the group Saturday morning and Realtor Chris Coile of Annapolis will be the luncheon speaker.

The Washington Building Congress will sponsor a seminar on prevention of construction claims. It will be held at 9:15 a.m. April 23 at the Key Bridge Marriott. Attorney James Tansey is chairman of the seminar. Information is available at 244-6481.

Sotheby Park Bernet International Realty Corp. has named Washington Samuel F. Beach Jr. to head the office it will open at 2903 M St. NW. in May.