At just 194sq ft, this poky north London flat is less than half the size required for new dwellings under current rules.
In fact it is smaller than many budget hotel rooms and just over three times the minimum area the Red Cross advises for a prison cell.
The first-floor apartment is located in a converted terrace house, walking distance from the Tottenham Hotspur Stadium, and doesn't appear to have an oven, a bath or a wardrobe.
However, images on the property listing show four kitchen cupboards, a small fridge, a narrow shower space and a separate toilet.
Clothes hang on a rail at the foot of a bed, while a television sits on a chest of drawers. As an existing dwelling, it can house two people and still not fall foul of the government’s statutory overcrowding rules.
Offered leasehold, the flat is on the market for £100,000, well below the £481,851 average for properties in the N17 postcode.
Opportunity knocks?
The agents describe the Willoughby Lane flat as “cosy and well arranged”, highlighting its favourable location "minutes away from Northumberland Park Overground Station".
Only available to cash buyers, it comes with a 91-year lease and a £250 per year ground rent.
Perhaps most likely to be bought to let on London's overheated rental market, the property is described as “an ideal opportunity for an investor”.
Rightmove data suggests a flat in the same house sold for £105,000 last year, while another went for £222,000 in 2017.
The situation for London renters
A spokesperson for the London Renters Union said: “While rents are rising, the amount of space renters are expected to live in seems to be shrinking year on year.
“It’s not right that somebody could be forced to pay as much as half of their income for a space not much bigger than the average hotel room.”
The spokesperson added: “We need the government to invest in social housing and bring rents under control to create a fairer, safer housing system that meets everyone’s needs.”
Amid a major housing crisis, ever more unlikely spaces are hitting the market in the capital.
It emerged earlier this month that a tiny west London flat with just one window was up for sale for £160,000.