"At the expiration of a lease or at the termination of a lease of a periodic tenant, no landlord of any dwelling as defined in § 260-1 may request or receive a percentage increase in rent which is greater than four percent or the percentage difference between the consumer price index three months prior to the expiration or termination of the lease and three months prior to the commencement of the lease term, whichever is less. For a periodic tenant or for a tenant whose lease term shall be less than one year, said tenant shall not suffer or be caused to pay more than one rent increase in any 12-month period, commencing 15 months prior to and ending three months prior to, the effective date of the proposed increase, whichever is less. However, as a result of the COVID-19 pandemic, no landlord may request or receive any rental increase at the expiration of a lease or the expiration of any periodic tenancy until the end of the state of emergency or six months from adoption of these amendments, whichever comes first. This paragraph shall be effective March 15, 2021."

https://www.jerseycitynj.gov/cityhall/HousingAndDevelopment/housingpreservation/landlordtenantrelations

Rent control ordinance. Essentially, a landlord can't raise your rent to an amount that outpaces inflation. The only way around it is putting the apartment back on the market, and they would need to give you 3 months notice before your lease is up to do that.