As the world population grows, the demand for clean, safe and affordable urban housing increases. Architects from around the world are responding with design concepts to provide urban housing as cheaply and efficiently as possible. High-density urban housing projects -- from the high visibility tower that makes a bold statement to the infill project that blends quietly into the city scape -- require inventive thought and complex design and finance solutions. This feature will provide profiles of a select group of new urban housing projects from around the world.