Now he may augment his salary and he may have an outside job but his salary is $3000.00 per annum. So please stop arguing with me on this. Every two to four years we have to go vote down an attempt to get in our back pockets.
http://www.saelections.com/mayor.html
The Mayor of San Antonio acts as the presiding officer of the City Council. He or she gets $3,000 per year plus expenses (as OK'd by the council) to serve in this office. The Mayor is actually just another member of the council, with one vote among the other ten. The Mayor is not able to hire or fire the City Manager (the most important post in the city), single handedly approve any ordinance or law brought before the Council, or hire or fire anyone in the City government. He must have an affirmative vote by no less than 6 of the City Council Members to pass any item (some items may require more votes). No meeting can be held without more than half of the council present (6 members including the Mayor).
I'd suggest you look at the Barret Report which gives his salary. The $300,000 may be the current mayors salary but it wasn't the salary when he was mayor. Here is another source:
http://archive.salon.com/news/feature/1999/06/25/cisneros/index1.html : "Then, in the fall of 1993, they stopped. With a government salary of $148,000, two daughters in college, and a son whose heart trouble required constant medical attention, Cisneros couldn't afford to continue supporting Jones as well."
$300,000 gross was probably close to what he was making including the income that he some how didn't report according to the OIC report