As land prices rise, home builder seek out ways to optimize the lots they have by increasing density, especially in urban areas. BUILDER's recent roundup shows some of the best ways that builders are doing more with less when it comes to land.

But in some crowded international cities (with lax zoning requirements), builders and architects have been able to stack and squish housing into places where it seems nearly impossible, reports senior editor Jennifer Goodman.

From teeming Hong Kong residential towers to a luxury hotel built into a rock quarry, these projects push the limits of land planning.

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