For rent-stabilized apartments, there are really two rents you need to keep straight: the legal rent the law allows you to charge, and the preferential rent the tenant is actually paying when you’ve agreed to charge less. The relationship between the two changed significantly after 2019, and getting it wrong is one of the easier ways for an owner to create overcharge liability.
Legal regulated rent, defined
The legal regulated rent — often just called the legal rent — is the maximum rent permitted for a stabilized unit under the rules. It is built up over time from the unit’s history: a prior legal rent, plus the Rent Guidelines Board increases applied at each renewal, plus any lawful adjustments such as approved improvements.
The legal rent is the figure you register with DHCR each year. It is the ceiling. Even if a tenant is paying less, the legal rent is the number that governs the unit’s regulated value and the baseline against which any future increase is measured.
Preferential rent, defined
A preferential rent exists when an owner agrees to charge a tenant less than the legal regulated rent. Owners do this for ordinary market reasons — to fill a vacancy, keep a good tenant, or match what comparable units are renting for.
The key point is that a preferential rent is a discount off the legal rent, not a replacement for it. The legal rent continues to exist in the background and continues to be what you register. The preferential rent is simply what the tenant pays under the current lease.
What the HSTPA changed
Before 2019, a preferential rent was generally a temporary courtesy: in many cases an owner could end it at the next renewal and raise the tenant up to the full legal rent. The Housing Stability and Tenant Protection Act (HSTPA) of 2019 changed that.
Under the HSTPA, where a tenant is paying a preferential rent, that tenant generally keeps the preferential rent for the life of the tenancy. The practical effects:
- You can still take the annual RGB increases, but they are generally applied to the preferential rent the tenant is paying — not jumped up to the legal rent at renewal.
- You generally cannot revoke the preferential rent and reset the tenant to the full legal rent mid-tenancy.
- The ability to reset toward the legal rent typically arises only on a genuine vacancy, when a new tenancy begins — subject to the rest of the stabilization rules.
This turned the preferential rent from a short-term concession into a long-term feature of the tenancy, which is why it deserves real attention at lease-up.
Why you must still register the legal rent
Even when the tenant is paying a lower preferential rent, you must continue to register the legal rent with DHCR — and report the preferential rent the tenant is actually paying. Both numbers belong in the record.
This matters for two reasons. First, the legal rent is what preserves the unit’s regulated value and the baseline you carry forward year to year, including the figure available on a future vacancy. Second, an unregistered or inconsistent legal rent undermines your own position later. If your registrations don’t show a clean, supported legal rent, you may struggle to establish what the lawful rent actually is when it counts.
The overcharge implications
The distinction is not academic — it is where overcharge exposure lives:
- Charging above what the tenant is entitled to pay. If a tenant has a preferential rent, billing them as if you could reset to the legal rent at renewal can create a rent overcharge claim.
- A weak rent history. Overcharge analysis looks to the registered rents. Gaps, missing preferential-rent entries, or an unsupported legal rent make it harder to defend the rent you’re charging.
- Expanded exposure. The HSTPA broadened the lookback period and the potential damages for overcharges, so errors in how you handle preferential versus legal rent carry more consequence than they did before.
The safe practice is straightforward: register both rents accurately every year, apply renewal increases to the rent the tenant is actually paying, and treat the preferential rent as durable for the life of that tenancy.
Bottom line
Legal rent is the ceiling you register and carry forward; preferential rent is the lower amount a tenant actually pays — and since the HSTPA, that lower amount generally stays with the tenant for the life of the tenancy. Keep both numbers in your DHCR registrations, apply increases to the right one, and your rents stay defensible. At Sterea, we set up leases and registrations so the legal and preferential rents are documented correctly from the start, which is what keeps overcharge risk off the table later.
This article is for general informational purposes and is not legal, tax, or financial advice. Rules change and the specifics vary by property — consult a qualified professional about your situation.