Go directly to the website Gabriel noted below, http://www.sccassessor.org.
There will be a box with a picture of a woman wearing a headset, and you'll see the question "I'd to look up the assessed value" and click on this. You'll enter your address, and the assessor will provide you with the address, value of the land, and the value of the improvements.
If you have any other questions about your property, give the Assessor's office a call at 408-299-5570.
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