(As nominated by Rat and Mouse readers)

I can't even imagine who could afford something like this (some ****-ing property blogger, no doubt) but when a house is described as "potentially the finest in St Johns Wood", it's probably worth a post. Dating from 1825, 44 Grove End Road is the former home to Jacques Joseph Tissot and Sir Lawrence Alma-Tadema. It's listed at (wait for it...) £17 million, with Goldschmidt & Howland. Go here to read the house's remarkable story.
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