You must have gotten bad directions. The mining claim records for Maricopa County are all held at 111 S 3rd Ave #102, Phoenix, AZ.
You don't need to actually go there physically to view mining claim records. They are available online. Check it out:
The Maricopa County public records only go back to 1871. Maricopa County did not exist until February 14, 1871. They have been the official record keeper for mining claim ownership ever since public notice of mining claims became the law in 1872. If a mining claim was located in Maricopa County the original records for that claim are at the County Recorder and nowhere else.
The recorder will make you a copy of the actual original paper records. No other entity can do that for you because by law all the originals are defined as public records under the direct care and custody of the elected recorder.
I've been obtaining copies of mining claim records from county recorders in Arizona and elsewhere for nearly 50 years. I obtained more than 5,000 copies of individual mining claim records in the Phoenix, Arizona region last year alone. Every single one of those mining record copies in all 4 counties came directly from the originals in the respective Recorder's archives.
Maybe study the subject a little more? You would greatly increase your research skills and possibly with some diligence learn how to find the answer to the question you posed.
Educate Yourself and Prosper
...or not
the choice is always yours