Offered a business, But what a mess.

My boss is in breach of 4-5 aspects of his lease to own contract since February 1 of this year. Today during a meeting with the owner/seller i was informed he wanted a coworker and i to take over the business. The problem is my boss technically owns the work trucks an equipment, while the original owner/seller who wants me to lease to own,as he owns the customer database. He (owner) says we may have to start new, since he doubts the current boss, ex-boss of mine will not give or sell us the vans because he's an asshole which i agree. What can i do ???? What steps can i take to get this company. Current boss is sole proprietor so all money from the company is in his person account.

Any help will do. Im confused as to all this.