Marylebone

BBC alumni of 35 Marylebone High Street might be surprised to learn that one of their landlords was Conegate - the property vehicle of mucky pictures and West Ham magnate David Sullivan.  He's sold the 999-year lease on to the Scottish Widows Investment Partnership, for £32 million, and the BBC will handover the essentially-empty 48,000 sq ft in six months.  The BBC had been trying to find a sub-tenant for the space, at around £800k a year - so presumably had some years to run on its tenure.  It doesn't look like the BBC received cash for quitting in this deal - but they probably don't have to put it back into original condition - and over the years, it's had substantial modification.  So the saving goes in the "costs avoided" column, not "cash in hand".

From the mid-17th century the land at the back of the site was denoted as "pleasure gardens", with bowling greens, gardens and walks - and gets a mention in The Beggars' Opera. Entrance was through the Rose of Normandy tavern, on 35 MHS.  In 1738, the area was partially enclosed for concerts and theatrical performances. An organ was installed, and G F Handel was among the performers.

The site was built over in 1778.  The Rose Tavern kept going, and 1856 added a music hall - The Marylebone - at the cost of £8,000 for proprietor Sam Collins.

I can't instantly track down when the BBC acquired the building - probably for the Radio Times in the 1950s ? The Listener was there in the 70s, and over the years it's played host to Training and Development, BBC London and the BBC Trust.