Which jibes with the $250k.
The article states he got 200k a year from "control of unions in the city, extortions from construction companies in exchange for labor peace and from secret partnerships in construction companies" in addition to "hundreds of thousands a year" in juice.
So we're already at 500k and this excludes his primary revenue source which were his own construction companies. He also had interests in nightclubs etc.
He was making far more than 250k.