This is all I can find:

Records show Paddock's knack for investing in real estate first developed when he was still a young man working as a postal worker. Besides the Nevada properties, records link him over the years to nine other houses, condos and apartment buildings.

While he took an $11,000 hit on the Florida house when he sold it, the records show Paddock bought and sold another property in Reno, two homes and an apartment complex in Mesquite, Texas, and at least four other properties in California. He profited handsomely from the sale of an apartment building he owned with a former wife and other family members. The building, purchased in 1992, sold for $3.2 million in 2004.

Eventually, around 2012, Paddock began spending more time in Reno, and sticking to his pattern, began buying property there. He also found a girlfriend. Although it is not yet clear how they met, Marilou Danley's job might have been the connection. An Australian citizen and former airline hostess and Avon sales representative, she worked for a time as a hostess to high-limit gamblers at Club Paradise at the Atlantis Casino Resort Spa.

Was this enough to fund his lifestyle?