"I'm overwhelmed," Csaky said. "I started crying when they told me."
For two years, Csaky, 52, has lived about 30 feet above the ground in a 300-square-foot self-made platform, accessible by a ladder counterweighted with sandbags on pulleys on city land.
Csaky outfitted the treehouse with a tent, wood stove, three chairs, shelves and a counter with an unplumbed sink. His pets include Lucky, a rat; Rainbow, a ferret; and Tilt, a squirrel. He was lately threatened with eviction because the treehouse is a health and safety concern.
Brandon Ferrante, 28, and Maria Bolander, 27, who befriended him after watching the treehouse take shape, found an aging 22-foot RV online after they learned of Csaky's situation.
"It broke our hearts," Ferrante said. "He's taken care of the neighborhood. We couldn't sleep at night. We decided to make it happen."
They and their landlords, Janet Yoder and husband Robby Rudine, agreed to buy the rig for $500 after the owner offered a special "Squirrelman" discount.
"David's a unique character but a good neighbor," Yoder said.
After delivering the RV Tuesday evening, owner Timothy Custer decided instead to sell it to Csaky for a penny.
"It's Dave's new house," Custer said.