It was lunchtime at Casa Lever, the high-end restaurant in the iconic Lever House, and Richard Baxter was on his BlackBerry negotiating.

It was a busy year for Mr. Baxter and his colleagues at Jones Lang LaSalle. His four-man team comprised some of the city’s most prominent brokers of large-scale commercial office buildings, and as the Manhattan sales market’s post-recessionary thaw continues, Mr. Baxter estimated that the group had tallied an impressive $1.3 billion in deals this year.

Three days before Christmas, however, it wasn’t one particular skyscraper Mr. Baxter was bargaining over from his plum seat at Casa Lever. In a year-end rush, his group had loose ends to tie up, deals to close and transactions still in the works. And so, on this particular Thursday amid a bustling lunch crowd, Mr. Baxter was not negotiating with a buyer or a building owner, but rather one of his own assistants, whom he was asking to stay late to receive critical documents and to help get the team through the rest of the day.

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