As to housing the inhabitants of the underworld at a reasonable rental, no one seems to have entertained the idea.
Lease holders and sub-lease holders, landlords and ground landlords, corporations and churches, philanthropists and clergymen have all got vested interests in house property where wretchedness and dirt are conspicuous.

"But," said a notable clergyman in regard to some horrid slum, "I cannot help it, I have only a life-interest in it," as if, forsooth, he could have more; did he wish to carry his interests beyond the grave?
I would give life-interest in rotten house property short shrift by burning the festering places.

But such places are not burned, though sometimes they are closed by the order of the local authorities.
But oftener still they are purchased by local authorities at great public cost, or by philanthropic trusts.

Then the human rabbits are driven from their warrens to burrow elsewhere and so leave room for respectability.
Better-looking and brighter buildings are erected where suites of rooms are to let at very high prices.

Then a tax is placed upon children, and a premium is offered to sterility.