The city's charter schools say the de Blasio administration is not giving them enough space to accommodate their growing needs.
Forty-five schools filed appeals after being denied additional space in city-owned buildings.
The state's education department ruled in favor of the charter schools in each of the appeals, with the exception of one.
State law requires the city to pay for the schools to rent privately-owned buildings if the city rejects a request to share space within a public school building.
Critics say the de Blasio administration denied the requests for political reasons.
But the city's education department says it has followed state laws and stands by its rulings.
The city is expected to spend about $40 million on leases for charter schools for the 2016-2017 school year.