In the developed world, housing for inner-city poor residents is characterized by at least three problems-poor quality, insufficient availability, and significant unaffordability. Often the physical conditions of the buildings need updates to be safe. Proper maintenance and repairs of plumbing, electrical systems, roofing, stairwells, and heating systems are often unaffordable to inner city residents. Landlords often delay making expensive repairs, so over time, the overall quality of the housing suffers