The campaign against Airbnb in New York City has claimed some surprising collateral damage – actual B&Bs. According to Mary White of BnB Finder, half of all the B&Bs in the city have closed down since legislation in 2011 aimed at limiting Airbnb abuses came into effect. The statewide law prohibits building owners renting rooms in residential buildings and apartments for less than 30 days.

The law may have been aimed at preventing apartment buildings from being turned into illegal hotels, but it has resulted in fines being issued to B&B owners. The owner of one of New York City’s B&Bs launched an advocacy group in 2011 that lobbies for changes in legislation but does not list its members. Given the legislation affecting B&Bs it is understandable that BnB owners would be hesitant to increase their exposure. A Crain’s New York Business article on the decline of B&Bs in New York City quotes the owner of a Brooklyn inn, who limits the amount of attention her business receives online in order to avoid city investigators:

Most people don’t even know B&Bs exist in the city. Now many innkeepers are keeping a lower profile, hoping not to attract the city’s attention.

The owner of a European-style inn in Brooklyn, who did not want to be identified, said she limits her online exposure by not listing her property with travel sites like Expedia. The reason is twofold: She wants to speak personally with her guests before they arrive to ensure “that the people who stay with us won’t steal anything from us,” and to keep out of the crosshairs of city investigators.

Airbnb has made enough on an impact in New York City for hotel industry representatives, local officials, and activists to launch Share Better, a coalition group which claims the popular site is contributing to New York City’s affordable housing crisis and allowing tenants to violate lease agreements. Earlier this month, I wrote about Share Better’s claims and discussed the regulatory gray area Airbnb operates in with MSNBC’s Eric Ortega and The New Republic’s Noam Scheiber.

As Share Better continues to make its arguments against Airbnb, regulators and lawmakers should not forget the recent decline in New York City B&Bs, the hard hit unintended victims of anti-competitive rental restrictions.