Marriott Corp., which lists its corporate address as Washington but has been based outside the Beltway in Bethesda since 1979, yesterday announced plans to build an office complex still farther north in Montgomery County.

Marriott said it has bought about 210 acres of land in Germantown, along Interstate 270 near the Rte. 118 exit, for a new corporate learning center and future expansion.

A press representative said he couldn't comment on whether the headquarters of the food and lodging chain might be moved to Germantown in the future.

Marriott officials said the property -- across I-270 from the former Fairchild Corp. offices -- was purchased from several sellers. They declined to disclose the price paid for the land.

The company is in the midst of expanding its present corporate headquarters off Democracy Boulevard in Bethesda, adding an additional 300,000 square feet of space to the half-million-square-foot building that houses about 2,500 of Marriott's 210,000 employes.

When Marriott moved from its old headquarters off River Road just outside the District, the Bethesda location was consider a long way from downtown and there were no other offices around. Now the Marriott headquarters is surrounded by facilities of such corporate giants as IBM Corp., Martin Marietta Corp., Electronic Data Systems Inc. and the Maryland home office of Sovran Bank.

Marriott's corporate training facilities, including its test kitchens and management education facilities, are now located in the lower level of the Bethesda building