A decision by the D.C. Board of Zoning Adjustment (BZA) last week cleared the way for Capitol Hill Day School, a private school, to lease and renovate the long-unused Dent public school at 200 South Carolina Ave. SE.

The BZA, by a 3-0 vote, granted a zoning exception, stipulating that the school be limited to 200 students and 19 staff members and that seven parking spaces be provided.

In another zoning action, the BZA allowed Columbia Hospital for Women to build a $7.5 million clinical services addition. According to Robert Sloan, the hospital's associate administrator, the addition will contain X-ray and laboratory facilities. The D.C. Department of Human Resources recommended that the hospital modernize such facilities, said Sloan.

The BZA deferred until its April 4 meeting a decision on whether to allow Saudi Arabia to operate a chancery at 2929 Massachusetts Ave. NW. The board asked the applicant to submit a revised parking plan for 20 cars. After studying the plan, the BZA will decide whether the chancery would be in keeping with the character of the neighborhood. At a hearing last month several neighbors and the Cleveland Park Citizens Association opposed allowing embassy offices at this location.

At the request of citizens groups and neighbors who opposed an earlier BZA decision to allow construction proposed by developer John O. Antonelli, the BZA agreed to rehear certain aspects of the case April 18. Antonelli proposes building a 90-foot-high office addition attached to three townhouses in the 1700 block of N Street NW.

In other actions, the BZA:

Granted the application of Mr. and Mrs. Reginald Dunkins for a variance to build an addition to a house in a residential zone at 6412 Eighth St. NW.

Granted the application of Mr. and Mrs. Henry P. Staley for a special exception to use the first floor of a building in a commercial zone at 927 Missouri Ave. NW as an auto repair garage, provided that shrubbery be placed along the property line to provide screening.

Denied the application of Mary H. Sherwood for a variance to use the first floor of a building in a residential zone at 1609 33rd St. for storage and servicing of motor vehicles.

Granted a final four-year extension for the National City Christian Church to continue the use of a parking lot at 1224 14th St. NW.

Denied the application of Chow Yung Ng for a variance needed to build a restaurant in a special purpose zone at 500 H St. NW.

Granted a final four-year extension for Donald S. Nash to continue the use of the parking lot in a special purpose zone at 309 G St. NW.

Granted the application of the 19th Street Limited Partnership for special exceptions and variances needed to build an office building in a commercial zone at 1137-45 19th St. NW.

Denied a request by the Dupont Circle Citizens Association and others to reconsider an earlier decision to grant Augustana Lutheran Church variances needed to operate a day care center in a residential zone at 1511 V St. NW.