Dean G. Skelos, the Republican majority leader in the State Senate, was a featured guest at a Sept. 19, 2012, luncheon of the Real Estate Board of New York at the organization’s Art Deco office tower in Midtown Manhattan.

He was there to talk to 30 executives about the coming election. At one point, Mr. Skelos spoke privately to Charles C. Dorego, an executive from one of the city’s most prolific residential developers, Glenwood Management.

Not for the first time, Mr. Skelos asked that Glenwood steer some title insurance business to his son, Adam B. Skelos, who worked in the industry. But Mr. Skelos had made it clear, “using explicit language,” according to prosecutors, that he would punish members of the real estate industry who were inadequate in their support.