A worked example
Same landlord, both tools.
Three-unit Berkeley triplex, two units covered, one unit Costa-Hawkins exempt.
Suppose you own a three-unit building in Berkeley, California. Two of the units are covered by Berkeley's Rent
Stabilization Ordinance (multi-unit, first certificate of occupancy before February 1, 1995). The third unit is
a detached cottage that qualifies as a single-family rental — and the current tenant moved in March 2024, so
under Costa-Hawkins (Cal. Civ. Code §§ 1954.50–1954.535) and BMC §13.76.080(A)(3) the SFR exemption applies
because the tenancy commenced after January 1, 1996.
At lease renewal in May 2026, you want to raise rent on all three units. TurboTenant collects the existing rent
and shows you each unit's payment history; it has no opinion on what the legal max is for any of the three.
That's where the math has to happen somewhere else.
RentCeiling's Berkeley calculator tells you the two covered units cap out at 1.0%
for CY 2026 (Berkeley Rent Board Regulation 1271, 65% × CPI-U San Francisco-Oakland-Hayward MSA July
2024 to June 2025), and walks you through the four-condition AGA-denial gate at BMC §13.76.110(B)(2) — Rent Board
registration current, no outstanding Rent Board orders, Cal. Civ. Code §1941.1 habitability satisfied, BMC
§13.76.080 5%-deposit-interest paid. The Costa-Hawkins exempt cottage falls under California AB 1482 at
8.8%, computed via the California calculator. RentCeiling generates
three notices: two Berkeley notices with the BMC citation and the 1.0% math, one California notice with the AB
1482 citation and the 8.8% math. Each notice computes its effective date from Cal. Civ. Code §827(b)'s
delta-driven rule (30 days for a delta under 10%, 90 days for 10% or more). You hand the PDFs to your tenants
or upload them to TurboTenant's document store and hand-deliver per your service-of-process preference.
The compliance log captures the CPI source, the formula, the gate state, the notice date, and the effective
date. Six months later, when one tenant disputes the increase and Berkeley's Rent Board asks for the worksheet,
you produce it from the log. The cost of that worksheet not existing is well-documented in BMC §13.76.150 —
rollback, refund, treble damages, attorney fees.