Renters at a $400/night Airbnb property in San Francicso were recently greeted with a handwritten note warning them that if they ran into any neighbors, to say they were friends of the family.

This helps avoid the new wave of startups hired by landlords concerned about quality of life or insurance issues, to investigate and catch hosts violating building regulations and local laws. One such is BNBShield which uses custom software to comb through listings in a given area and match visual or verbal with known features in a specific building. As a result, many hosts avoid postings with photos of the outside of a building or other identifying features.

Every city has different reasons for looking to regulate Airbnb, including housing shortages, taxation and quality of life issues

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