Conjoined Housing (often Downtown)
Condominium
Apartment
And you really don't have much choice in terms of the methods they were made.
Thus if you are an environmentally conscious person you might be very upset to learn what the carbon footprint of building and maintaining your home is. Thus comes up the issue of Sustainable Architecture: Buildings built with the concept of preserving the environment in mind.
And this isn't just true of architecture and building practices, but in other disciplines as well such as fashion design (see Sustainable Fashion).
The photo shown above is the Bosco Vertical Forest. Its a condo that follows the idea of creating an eco-friendly architecture which actually contributes to the atmosphere (and looks pretty kewl too).
Who wouldn't want to live in that?