“Your monthly rent .. shall increase from $2145 to $8900”
Here is the home: http://www.trulia.com/homes/California/San_Francisco/sold/71...Taxes are 11,043 with a value of 904,085. $2145 looks like an EXTREMELY low rent for a house of this size in San Francisco. (half of the rent is just property taxes.) The landlord was likely losing money keeping it rented at $2145 even if he owned it free and clear.