Hi Iwant sue x tenant for unpaid rent of 3 month, $6900. I went to the court, asked application. A lady told me I must have the tenat current adress. I asked the tenant multiple time, refused Any advice. what can i do

You have to provide an address to serve the other party. Search online, do you know where they work? If you have to hire an inverstigator, hire one.

Mail letter to the address you rented to the tenant with the message to post office..."forwarding address requested." The post office will return the letter back to you with the current address of your old tenant.