Music-mixing company Solid State Logic, which has numbered Sting, Eric Clapton, and Peter Gabriel among customers for its hi-tech consoles, is to sell off buildings at its Begbroke production base.
The company, founded in 1969 by entrepreneur Colin Sanders, is selling an old coach house and the Old Junior School, now used as a staff canteen.
A spokesman said: "There were not enough people using it. There are two very good pubs nearby."
Staff numbers have fallen since 1999 from 250 to 200.
Planning permission has been granted to convert the Coach House into three homes, and build two others on the site.
Mr Sanders, who died when his helicopter crashed near his home in Souldern, Bicester, in 1999, sold the company in 1986 for £27m.
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