SYRACUSE, N.Y. – Onondaga County officials today approved $71 million in tax breaks to support development of a big $350 million warehouse in the town of Clay that is expected to employ at least 1,000 workers.

The county Industrial Development Agency unanimously approved the deal, which will benefit a still-unnamed tenant that some logistics experts say will be Amazon.

The package of incentives includes a 15-year property tax discount worth $49.1 million, a sales tax exemption estimated at $20 million and a $1.7 million exemption from the state mortgage recording tax.

The speedy approval by OCIDA conforms to the timetable requested by project developer Trammell Crow Co., which aims to begin construction in March 2020, County Executive Ryan McMahon said today.

The town of Clay is expected to vote in November on a proposed zone change requested by the developers, McMahon said.

Trammell Crow has said the facility would encompass nearly 3.8 million square feet. That would make it the second-largest warehouse in the world. The facility would cover about 76 acres of a 111-acre site now occupied by the Liverpool Public Golf and Country Club at the northwest corner of Morgan Road and the Liverpool Bypass.

At a public hearing on the project last week, critics said the identity of the facility’s user should be revealed before OCIDA voted on the deal. McMahon said today that the tenant does not want to reveal its plans until it has a lease to operate the facility, partly for competitive reasons. The lease can’t be finalized until the property is zoned for the project.

In the meantime, McMahon said, the public has enough information to understand the value of a project that will result in a $40 million annual payroll.

"They can figure out who the top three or four or five e-commerce companies are -- it’s one of them,'' he said. “It shouldn’t matter which one it is, right?”

He called the project "the largest investment in a generation'' in the county.