[kragen]

49 m² per person, enough for a small house, not 5. If you build a skyscraper (or, more ambitiously, underground) you could have luxury space for hundreds of people. Energy would be a problem, but not as much of a problem as the Belizean government.

    $ units
    Currency exchange rates from FloatRates (USD base) on 2019-05-31 
    3460 units, 109 prefixes, 109 nonlinear units

    You have: 1.2 acres
    You want: 
            Definition: 4856.2277 m^2
    You have: 1.2 acres/100 people
    You want: 
            Definition: 48.562277 m^2

[Apocryphon]

Coming soon: Caribbean Walled City

[kragen]

Less useful in the era of high explosive artillery shells, much less high-altitude bombers, cruise missiles, ballistic missiles, and precision-guided munitions.

[Fatnino]

I think this has nothing to do with defence and everything to do with Kowloon Walled City that was sort of a no law enclave where everything was built very high and shoulder to shoulder to maximize floor space.

https://en.m.wikipedia.org/wiki/Kowloon_Walled_City

[kragen]

Oh, I was just thinking of https://en.wikipedia.org/wiki/Walled_city, which describes nearly all cities for the past ten thousand years, though less so for the last 5% of that time.