I have a little Realtor secret for you:
If you click in the left sidebar on “Assessor/Parcel Information” and then again in the left sidebar on “Parcel Search” you can search for information on almost any property in Maricopa County if you have the address or the street name and last name of the owner. You can find out the exact square footage and year built of your own property if you don’t know it. You can also see what properties were originally purchased for and the taxes paid on them. Play around with it; it can be an interesting and informative site.