The construction of new SROs or conversion of existing homes to multiple SRO units was banned in New York City in 1955 due to concerns that they provided "substandard housing conditions" that were "improper and unsafe". Renters of illegal SRO units typically live in units that do not meet health and safety standards; as well, since the units are unregulated, the renters do not have protection against eviction or rent increases. Many SRO buildings, particularly in major cities, face strong development pressure for conversion to more profitable uses as condos, luxury apartments or high-end hotels. Some cities have regulated the conversion of SROs to other uses in order to prevent landlords from forcibly evicting SRO tenants, while conversely many others conversely limit the conversion of other uses into SROs and restrict them via zoning. Some cities do both simultaneously, protecting existing SROs while making it virtually impossible to create new ones. A 2014 article about SRO housing in San Francisco stated that SROs have become a "key urban built environment used to house poor populations with co-occurring drug use and mental health issues"; specifically, it found that women drug users in SROs have more "post-traumatic stress disorder (PTSD), anxiety, and depression versus "stably housed women".