Drawing of the proposed boiler room in the basement of a block of flats in Bloomsbury – the space is being re-configured to accomodate a Ã250,000 flat. See SWNS story SWBOILER; A boiler room in the basement of a block of flats is expected to sell for more than Ã250,000 at auction. Buying a home in London is getting more and more out of reach for most people with the average property exceeding Ã500,000 for the first time. A typical home now costs Ã768,000 in fashionable Bloomsbury – but an unusual opportunity has popped up for someone looking buy in one of the cityÃs most expensive boroughs for a fraction of the normal price. The two-room basement in Bloomsbury was used to provide heating and electricity to residents.