The RPW Group will invest $15 million in the build-out of 450 Mamaroneck Ave. in Harrison.
The Rye Brook-based company described its intentions Thursday morning at a meeting of the Westchester County Industrial Development Agency, whose board voted to prepare a financial incentive for RPW.
The company seeks a $195,000 mortgage tax exemption for the project.
RPW bought the former Citibank building three years ago when it was empty; half of it is now fully leased and the build-out is to prepare the other half of the building, about 176,000 square feet, for leasing.
Major tenants in the leased portion of the complex include The Bank of New York, Castle Oil and Athlete Evolution.
The project is expected to create 39 construction jobs over the next two years.