David Prenatt, the Montecito real estate investor who took in $18 million from more than a dozen people and then used the cash to support what a bankruptcy trustee called “lavish spending habits,” is headed for a sentencing in federal criminal court on Dec. 9. Prenatt struck a deal with federal prosecutors this summer and pleaded guilty to giving false loan application information to Lompoc-based CoastHills Federal Credit Union. Prenatt’s creditors forced him into an involuntary bankruptcy proceeding in 2009. Earlier this fall, his former wife Maria Prenatt filed for personal bankruptcy claiming $27.1 million in debts.