The 41-year-old Walker Building at 734 15th St. NW has been sold for $3 million to a limited partnership. A spokesman for Barnes, Morris & Pardoe Inc., which handled the transaction, said the new owners plan an extensive renovation of the 12-story building.

The Montgomery County Office of Consumer Affairs will hold a series of home improvement courses, beginning Thursday evening, at the County Office Building in Rockville. Open only to county residents, the classes will have registration on a first-call basis. call 279-1776.

The area chapter of the Community Associations Insitute will sponsor a program on condominium ownership and VA financing Tuesday at the Key Bridge Marriott motel. It will begin at 7:30 p.m. For information, call 588-8668.

The next session of a course in real estate law in the District, sponsored by the Consumer Real Estate Center, will be taught by attorney Benny L. Kass from 10 a.m. to 1:30 p.m. today at the Georgetown Holiday Inn. The course is designed for brokers and agents. The fee is $35 a person. The next session of the course, How to Sell Your Home -- With or Without a Broker, will be offered by the Consumer Real Estate Center March 24 at the Key Bridge Marriott from 10 a.m. to 1:30 p.m. For information about both sessions, call 649-6666.

Broker Evelyn Metz has announced that DisCount Realty Inc. has been appointed local representative of International Referral Exchange, based in Jenkintown, Pa.