in the 1920s, an average house in London cost about £750.
A GBP was worth about 2.5USD, gold was worth 35USD an ounce.
if you owned a 5k house in the 1920s, that's about £12,500USD or 357 ounces of pur gold. The same amount of gold is 357 * 2160USD = $771k or £617k.
£5k in 1920 could buy you...