Today, a report will be released by Budget Analyst Harvey Rose that provides new analysis of the impact of short-term rentals on The City, drawing comparisons between longer-term hosts and evictions and estimating that in some neighborhoods Airbnb units could comprise as much as 40 percent of potential rentals.

Requested by Supervisor David Campos, the report comes just four days before the Board of Supervisors Land Use and Economic Development Committee is expected vote on how to amend the short-term rental regulations that took effect Feb. 1.

Between 925 and 1,960 units citywide have been removed from the housing market by hosts renting out entire units on Airbnb for more than 58 days, the report estimates. While this total comprises a small fraction of San Francisco’s 244,012 rental units, it does represent up to 23.2 percent of the total citywide vacant units, which are estimated at 8,438, the report says.

“Airbnb has made a lot of claims that they are not impacting our housing stock. This demonstrates that they clearly are,” Campos said during an interview with The San Francisco Examiner. “And that in some neighborhoods like the Mission the impact is so significant that it’s definitely pushing people out.”

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The report draws a comparison between the number of evictions in neighborhoods with the most hosts, though notes there is no way to draw a direct connection. In the Mission, for example, there were 315 hosts last year and 323 evictions.

“There seems to be a connection,” Campos said. “We won’t know for sure until we actually get Airbnb to give us the information.”

The report draws a distinction between commercial hosts, those booked in excess of 58 days, and casual hosts, and bases its analysis on 6,113 Airbnb listings identified in December, of which nearly 4,200 were casual hosts. The impact on the housing stock is based on commercial hosts, which the report defines as those not supplementing living expenses but treating short-term rentals as a steady source of income.

Those debating the regulations talk about striking the right balance, such as with the cap on the number of allowable stays per year. Current law states there can only be 90 days for unhosted stays but unlimited days when a host is present. That is being proposed to change to 120 days for all types of stays by the Planning Commission. Campos is pushing for a 60-day cap. A proposed short-term rental measure for the November ballot proposes a 75-day cap.