Watch Your Back! by Donald E. Westlake

Watch Your Back! (Dortmunder Novels) - New York fence, Arnie Albright, comes back to New York with a plan for a huge heist.  He has met millionaire Preston Fareweather who is hiding outside the country to avoid being prosecuted by his ex-wives.  Meanwhile, his Fifth Avenue penthouse is nearly unguarded.   Albright asks Dortmunder and his gang to rob the apartment offering them seventy percent of the take.

Meanwhile, a would-be mob capo has taken over the OJ, where Dortmunder and his gang plan their jobs.