Locating owners of LLC

[Katie Mcfetridge]

Hi. I hope this is the appropriate forum. I am currently involved in a child support dispute. My ex flips homes in pa. Typically he buys a vacant lot and builds a town home on it. My question is how do I find out exactly how many lots he has purchased or will purchase in the future if he uses the address as an LLC name? Surely there has to be a traceable way to determine this but I am having a very difficult time. Is there someone specific I need to hire to find this info out? He is not claiming the profits for this flipped properties for child support reasons. Thank you.