Paul Tyrrell states that when New York City housing prices rose in the early 2000s (decade), SRO landlords tried to remove longtime SRO tenants to use their real estate for more lucrative uses (one of these being Airbnb-style short-term rental). The owners of the Ace Hotel, a former SRO facility, converted their building to a luxury hotel, with only a few long-term, low-income SRO tenants using their leases to stay in the hotel. There are about 100,000 illegal SRO units in New York City, many of which are "unsafe, with too many people" for the space and a lack of proper fire exits and ventilation. Some landlords who wish to convert their old SRO hotel into a luxury boutique hotel may harass the renters or bribe the low-income tenants so they will leave. New York City law requires building owners to receive a certificate of no harassment (CONH) in order to demolish or convert their building to prove they were not intentionally forcing tenants out through harassment or bribery. NYC residents of illegal SROs are reluctant to complain to housing authorities about the condition of their units or rent regulation violations, as doing so could lead to their eviction.