A $30 million plaza including a luxury hotel, office building, retail stores and a discotheque is scheduled to open in Georgetown next April, Four Season Hotels Ltd. of Canada, part developers of the plaza, announced yesterday.

Now under construction at Pennsylvania Avenue and M Street NW, the Georgetown Plaza, designed by Skidmore, Owings & Merrill, will consist of two L-shaped buildings - a 218-room Four Seasons Hotel and a 71,000 square foot office building.

The five-story hotel will be one of the most expensive in the area and will have dining facilities "second to none" in the area, predicted Wolf Hengst, who will manage the plaza. Hengst last managed the Shoreham Hotel.

The new hotel, like the other 13 Four Seasons hotels in the world, will cater to high-income business and government leaders and to small groups.

The plaza's dining facilities, which will include a French restaurant, garden terrace restaurant, outdoor cafe and banquet rooms, will be used to help tie the plaza to the rest of the Georgetown community.

"Timeless elegance - sophisticated - but not snobbish - is the atmosphere we plan to create," Hengst said.

The hotel will have many European features, such as a small lobby and a concierge. Guest rooms will have separate sitting areas and will be decorated with marble, he added.

Downstairs, ballrooms handling up to 800 people will open onto the C&O Canal along the rear of the plaza.

The office building, separated from the hotel by a courtyard with a French-type cafe, will have 12,000 square feet of space for retail stores on its lower level, as well as a semi-private nightclub. The office building will sit behind a row of old townhouses which have been left along Pennsylvania Avenue.

Parking for 300 cars will be available under the plaza complex, which is bordered on its sides by 29th Street NW and a Rock Creek Parkway access ramp.

The other developers in the project are J.B.G. Associates, a real estate development firm, and D.W.S. Washington Holding Co. Inc., a subsidiary-of the Louis-Dreyfus Property Corp., an international real estate firm.