Here in the Bay Area there are several companies that provide information as a packet to the buyer. This report is normally part of the combined hazard report. This report normally outlines natural hazards, geological hazards, information on the impact of mold,lead, and radon in the home as well as informational on the taxes related to the property and the potential for a supplementary tax bill or mello roos assignment.
You can also call/contact the local tax accessor's office and they will be able to tell you.
Go to this website: http://www.sjgov.org/treasurer/OnlinePay.htm
It looks like it is for paying your taxes but it actually will give you the specific property tax bill for any house in San Joaquin County including Tracy. You have to click on the "Don't know your parcel number? CLICK HERE to look it up by address". Then after you know the parcel number of the property address you want to look up, click on the 'I have read and agree with the above disclaimer". Type in the parcel number in the search criteria box & press submit. There you go, it should pop up & gives you so much information. How you can calculate what your future taxes are on this property, would be to take the "prop 13 tax amount" and take your future purchase price & it will be 1% for our area. For example, if you plan to pay $200k for a home, then you would plop $2,000 in that spot & add up all the rest of the figures because they don't change when you purchase the home for any price. Hopefully this helps you tremendously.
You should get the address and contact the tax accessor's office let them know that you are interested in purchasing the property and they should be able to give you the information you are looking for. If you run into any problems please feel free to contact me and I will assist you free of charge. Best of luck. Hope to hear from you soon.