An update to this post. The eviction notice was extended through April 18th, giving Csaky time to move his possessions. A second stroke of good luck followed, with two neighbors giving Squirrelman an RV to live in. According to the Seattle PI article:

Brandon Ferrante, 28, and Maria Bolander, 27, neighbors who watched Csaky build his treehouse and befriended the self-taught carpenter, found the RV on Craigslist after they learned of Csaky’s situation.

The pair, along with their landlords, Janet Yoder and husband Robby Rudine, agreed to buy the rig for $500 after its owner offered a special “Squirrelman” discount.

“It broke our hearts,” Ferrante said of the eviction notice. “He’s taken care of the neighborhood. We couldn’t sleep at night. We decided to make it happen.”
The RV — a 22-foot aging Monaco — arrived at 6:40 p.m. Tuesday, delivered by the owner, Timothy Custer.

When Custer witnessed the commotion around the doomed treehouse, though, he had a change of heart. He sold the rig to Csaky for a penny.

Full article here.

HOW TO HELP
People who wish to donate to Csaky, or know of a place to park his RV, should contact Janet Yoder at jlyoder@aol.com or send contributions in David’s name to Lake Union Mail, 117 E. Louisa St., Seattle 98102.