The city is set to announce on Friday that an 84-unit affordable housing development on an empty, city-owned lot in the Bronx will become the first to use an expedited process that cuts the length and layers of reviews for projects to be approved, said Dina Levy, the commissioner of the city’s Department of Housing Preservation and Development.

The new process, created by the ballot measures, could be reduced to just 90 days from about seven months.

The Bronx development, called Powerhouse Apartments, will be 100 percent affordable and include 30 units for formerly homeless New Yorkers.

Under the old process, the proposal would first be reviewed by a community board for 60 days, then by the borough president for 30 days, then by the City Planning Commission for 60 days and finally by the City Council for at least 50 days.

The new fast-track will have a 60-day review by the community board and borough president take place simultaneously, followed by a City Council review for 30 days.

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City officials said they expected to use the same fast-track process on dozens of additional city-owned lots in the coming months.

Also on Friday, the city will announce that it is using the fast-track process to buy a 3.7-acre lot to expand the Saw Mill Creek Marsh park on Staten Island, said Alec Schierenbeck, the general counsel of the city Planning Department.