Skyscrapers & high-density residential services; also higher electric tiers?

Tier 3 housing doesn't seem to last on large-scale construction projects, and food supplies quickly run out when population density is too high. Having a way to both pack more people into a smaller space (at dramatically higher cost) and provide more food for the increased population would be quite beneficial, and would also fit within the game's context of starting from scratch and returning to modern luxuries. Skyscraper residential complexes would fit this concept beautifully.

As an added note, having more efficient power generators would also help a great deal. Whether this is desired is up to the developers.