From the San Francisco Rent Board:
“Effective March 1, 2012 through February 28, 2013, the allowable annual increase amount is 1.9 percent. In accordance with Rules and Regulations Section 1.12, this amount is based on 60 percent of the percentage increase in the Consumer Price Index (CPI) for All Urban Consumers in the San Francisco-Oakland-San Jose region for the 12-month period ending October 31, which was 3.2% as posted in November 2011 by the Bureau of Labor Statistics.
To calculate the dollar amount of the 1.9 percent annual rent increase, multiply the tenant’s base rent by .019. For example, if the tenant’s base rent is $1,250.00, the annual increase would be calculated as follows: $1,250.00 x .019 = $23.75. The tenant’s new base rent would be $1,273.75 ($1,250.00 + $23.75 = $1,273.75).”