Key Takeaways
- Union City caps rent increases at 3% or 50% of CPI (whichever is lower) — far stricter than California's AB 1482 which allows CPI + 5%
- Pacifica allows 5% annual increases or 50% of CPI (whichever is lower) — but requires 120 days' notice and mandatory mediation
- Both cities exempt properties built after specific dates — Union City (1995) and Pacifica (2015) have different exemption thresholds
- Non-compliance can result in $500-$5,000 fines per violation plus attorney fees — cities actively enforce through tenant complaints
- You cannot evict tenants for not accepting rent increases above the caps — "no-fault" eviction protections apply to both cities
- Local ordinances override state law — AB 1482 only applies where local rent control doesn't exist or is less restrictive
Why Union City & Pacifica Matter to Self-Managing Landlords
You might think California's statewide AB 1482 rent cap applies everywhere in the state. You'd be wrong. Union City (Alameda County) and Pacifica (San Mateo County) have enacted local rent control ordinances that are significantly more restrictive than state law. If you own rental property in either city, you're subject to those local limits, not the state caps.
This matters because many self-managing landlords discover this too late. They calculate a rent increase at 8% (AB 1482's maximum), send a proper 30-day notice, and then receive a complaint from their tenant or a warning letter from the city. Both cities actively enforce their ordinances, and the penalties are steep: fines starting at $500 per violation, mandatory mediation delays, and legal exposure.
As of October 2026, Union City and Pacifica represent two of the tightest rent control regimes in the Bay Area. Understanding their specific rules—and how they differ from each other and from state law—is non-negotiable if you manage property there.
Union City Rent Control: The 3% Cap
The Core Rule
Union City Municipal Code Section 10.50 imposes a straightforward cap: annual rent increases are limited to the lesser of 3% or 50% of the current-year consumer price index (CPI) for the San Francisco Bay Area.
What does that mean in practice? In 2026, if the Bay Area CPI is at 3.2%, you could increase rent by 1.6% (50% of 3.2%). If CPI drops to 1%, you can increase by only 0.5%. You can never exceed 3%, regardless of how high CPI goes.
For example:
- Current rent: $2,000/month
- CPI for year: 4.0%
- 50% of CPI: 2.0%
- Maximum increase: lesser of 3% or 2.0% = $40/month (2%)
- New rent: $2,040/month
Compare this to AB 1482's statewide rule: CPI + 5% (typically 8-9% annually). Union City's cap is roughly one-third to one-half as much room to raise rents.
Notice Requirements in Union City
You must provide 90 days' written notice before the rent increase takes effect. The notice must include:
- The current rent amount
- The new rent amount
- The effective date of the increase
- The calculation method (CPI percentage used)
- A statement that the increase complies with Section 10.50
Unlike some California cities, Union City does not require written explanation of how you calculated the percentage. However, it's prudent to document your CPI source (U.S. Bureau of Labor Statistics Bay Area series) in case the city questions your compliance.
Exemptions in Union City
Properties are exempt from Union City rent control if built after January 1, 1995. This is a hard cutoff. If your building received its certificate of occupancy in 1995 or later, you're exempt and can charge market-rate rents with any increase allowed under AB 1482.
Other exemptions include:
- Owner-occupied buildings with 2-4 units where the owner occupies one unit
- Single-family homes (unless part of a condominium complex built before 1995)
- Mobile home parks (subject to separate state law)
To claim an exemption, you must have clear documentation: building permits, certificate of occupancy, or title showing the construction date. The city may request this, and burden of proof lies with the landlord.
No-Fault Evictions & Union City
Even if you follow Union City's rent cap, you cannot use an eviction to retaliate against a tenant who objects to the increase or requests mediation. Union City strictly prohibits "no-fault" evictions (Owner Move-In, Ellis Act, etc.) as a substitute for rent increase compliance.
In other words: if you want to remove a tenant because they won't accept a capped increase, you need "just cause" under California law. Non-payment, lease violations, or legitimate owner move-in are examples. "They wouldn't pay my proposed rent increase" is not valid.
Pacifica Rent Control: The 5% Cap with Mediation
The Core Rule
Pacifica Municipal Code Chapter 9.80 sets a different threshold: annual rent increases are limited to the lesser of 5% or 50% of CPI. On the surface, this is less restrictive than Union City (5% vs. 3%). But Pacifica adds procedural complexity that Union City doesn't require.
Using the same example as above with 4.0% CPI:
- Current rent: $2,000/month
- CPI for year: 4.0%
- 50% of CPI: 2.0%
- Maximum increase: lesser of 5% or 2.0% = $40/month (2%)
- New rent: $2,040/month
In low-CPI years, both cities converge to the same cap. When CPI is higher, Pacifica allows more room (up to 5% vs. Union City's 3%).
Notice & Mediation Requirements in Pacifica
Pacifica's procedural requirements are more demanding than Union City's. You must:
1. Provide 120 days' notice (vs. Union City's 90 days) before the increase takes effect. This must include:
- Current rent amount
- Proposed new rent amount
- Effective date
- A statement that the tenant has the right to request mediation
- Contact information for the city's Rent Increase Dispute Resolution Program
2. Offer mediation if requested. If the tenant disputes the increase within 30 days of receiving notice, you must participate in mandatory mediation with a city-appointed mediator before the increase can take effect.
Mediation is non-binding, but it delays the rent increase. If mediation fails, the original increase can proceed. However, a mediator may suggest a lower increase that you could accept. Many landlords use mediation as an opportunity to negotiate a middle ground with long-term tenants.
3. Comply with timing sequencing. The 120-day notice period is measured from service date to effective date. You cannot compress or calculate it differently. If you serve notice on January 1, the earliest the increase can take effect is April 30.
Exemptions in Pacifica
Pacifica exempts properties built after January 1, 2015—a much more recent date than Union City. This means fewer Pacifica properties are exempt overall.
Additional exemptions:
- Single-family homes and duplexes (except condominiums)
- Owner-occupied buildings with 2-4 units
- Properties with only one unit
Pacifica's exemptions are narrower than Union City's because the 2015 cutoff already excludes most newer construction. If your property is pre-2015, check the specific unit count and ownership structure to confirm coverage.
Key Differences: Union City vs. Pacifica
| Factor | Union City | Pacifica |
|---|---|---|
| Annual Cap | 3% or 50% CPI (lesser) | 5% or 50% CPI (lesser) |
| Notice Period | 90 days | 120 days |
| Mediation Required | No | Yes, if tenant disputes |
| Exemption Date | Built after 1/1/1995 | Built after 1/1/2015 |
| Owner-Occupied Exemption | 2-4 unit buildings | 2-4 unit buildings |
| Single-Family Exempt | Yes (standalone homes) | Yes (except condos) |
How These Local Caps Override AB 1482
California Civil Code Section 1954.53 establishes that local rent control ordinances take precedence over AB 1482 when the local ordinance is stricter. Union City and Pacifica are definitively stricter—their caps are lower and their notice requirements are longer.
This means:
- You cannot cite AB 1482 as justification for exceeding Union City or Pacifica's caps
- If the city audits your rent increase, it will apply local law, not state law
- Tenants have the right to challenge increases above local caps, even if they'd be legal statewide
If you own properties in multiple California cities, you must track each location's specific rules. A 8% increase might be legal in Sacramento but illegal in Union City.
Documentation & Record-Keeping for Compliance
Both cities may audit landlord compliance. To protect yourself, maintain clear records:
For Union City:
- Save the 90-day notice letter you served on tenants (with proof of service)
- Document the CPI percentage you used (print from U.S. Bureau of Labor Statistics)
- Keep the calculation showing the increase does not exceed the applicable cap
- Store lease agreements showing the previous rent amount
For Pacifica:
- Save the 120-day notice letter (with proof of service)
- If mediation occurred, keep notes or the mediator's summary
- Document CPI sources
- Keep evidence of the agreed increase amount if you negotiated during mediation
Use property management software like LeaseBase's Compliance Engine to automate notice generation and track deadlines. This eliminates manual calculation errors and ensures you're always within local limits.
Penalties for Non-Compliance
If you violate Union City or Pacifica rent control rules, consequences include:
- $500-$5,000 fines per violation (each month of non-compliant rent is one violation)
- Required reimbursement of overcharged rent plus interest (typically 5-10% annually)
- Attorney fees and court costs if the tenant sues
- Mandatory mediation or administrative hearing to resolve disputes
- Damage to rental history — city records show violations, affecting future refinancing or sales
Tenants can file complaints with the city housing department or small claims court. Many tenant organizations in both cities actively monitor landlord compliance and advise tenants of their rights.
How to Calculate Your Compliant Rent Increase
Follow this step-by-step process:
Step 1: Determine Your Local Cap
- Union City: 3% or 50% CPI (whichever is lower)
- Pacifica: 5% or 50% CPI (whichever is lower)
Step 2: Look Up Current CPI
Visit the U.S. Bureau of Labor Statistics website and find the "San Francisco-Oakland-San Jose" Consumer Price Index for "All Urban Consumers." Use the most recent 12-month percentage change.
Step 3: Calculate 50% of CPI
Take the CPI percentage and divide by 2. This is your second benchmark.
Step 4: Apply the Lesser Cap
Compare the percentage caps and use whichever is lower. Multiply current rent by that percentage to get the dollar increase.
Example for Union City (October 2026):
- Current rent: $1,800/month
- Bay Area CPI (most recent 12 months): 3.4%
- 50% of CPI: 1.7%
- Union City cap: 3%
- Applicable cap: Lesser of 3% or 1.7% = 1.7%
- Increase amount: $1,800 × 0.017 = $30.60
- New rent: $1,830.60/month
Step 5: Serve Proper Notice
- Union City: Serve 90 days before effective date
- Pacifica: Serve 120 days before effective date, mention mediation right
Use LeaseBase's Lease Operations module to generate compliant notices automatically. The system can calculate caps based on your city and store proof of service.
Rent Increase Banking: Can You Skip a Year in These Cities?
Some California cities allow "rent increase banking"—skipping a year's increase and applying it in a future year. Union City and Pacifica are less explicit on this issue, and interpretation varies.
Union City's stance: The ordinance does not explicitly prohibit banking, but the annual cap is described as a per-year limit. Most legal interpretations suggest you cannot accumulate unused increases across years. Consult the city's housing authority for clarification if you plan to skip a year.
Pacifica's stance: Similar ambiguity. However, because mediation is required if tenants dispute increases, banking becomes complicated—you'd need tenant agreement to defer or combine increases. In practice, annual increases are simpler.
When in doubt, take the conservative approach: increase rent annually within the cap, or negotiate explicitly with tenants if you want to defer increases.
Frequently Asked Questions
Q: Can I increase rent if the tenant hasn't had an increase in 2 years?
A: No. Both Union City and Pacifica caps are annual limits, not multi-year allowances. You can only increase once per 12-month period, and only by the applicable cap percentage. You cannot "double up" or make retroactive adjustments for previous years when you didn't increase rent.
Q: What if my property was built on January 2, 1995 (Union City) or January 2, 2015 (Pacifica)?
A: The ordinances typically use "after" language, meaning January 1 is the cutoff date. A property completed on January 2 would likely be treated as subject to rent control. Check the exact language in each city's ordinance and request a written determination from the housing department if you're unclear.
Q: If a tenant refuses to pay the increase and leaves, is that a legal termination?
A: Yes. A tenant choosing to move rather than pay a compliant increase is their decision. You cannot unlawfully evict them, but you can accept their notice of vacating. If they stay without paying, then you can begin eviction for non-payment. Make sure the increase complies with local law first—if it doesn't, the tenant has grounds to sue.
Q: Do utility services count as part of the rent for the cap calculation?
A: Generally, no. Rent is the base payment for occupancy. If you separately bill utilities, those don't count toward the rent-cap calculation. However, if utilities are included in the rent and you want to shift costs to tenants, the change might be recharacterized as a rent increase, which would be subject to the cap. Check with each city's housing department for nuance.
Q: What if I own a duplex and live in one unit—am I exempt?
A: Both Union City and Pacifica exempt owner-occupied 2-4 unit buildings. If you occupy one unit and rent the other, your rental unit is exempt from the cap. You must maintain occupancy in your unit to preserve the exemption. If you move out, the exemption terminates and future rent increases become subject to the cap.
Tools to Stay Compliant
Managing rent increases across multiple rent-control jurisdictions requires precision. Use these tools:
- LeaseBase Compliance Engine: Automatically calculates compliant increases based on your property's location and stored CPI data. Learn more.
- LeaseBase Lease Operations: Generates and tracks notice service, meeting local timeline requirements. View features.
- BLS CPI Tool: Visit Bureau of Labor Statistics to look up current Bay Area CPI.
- Union City Housing Department: Call (510) 675-7300 or email for compliance clarifications.
- Pacifica Housing Department: Call (650) 738-7400 for questions on mediation or exemption status.
Planning Ahead: Budget for Lower Rent Growth
If you own in Union City or Pacifica, adjust your financial projections. A 3% annual increase (Union City) grows rent far more slowly than the 8-9% possible under AB 1482 statewide.
Example over 10 years (starting rent $2,000/month):
- Union City (3% annually): Rent reaches $2,684/month
- Statewide AB 1482 (8% annually): Rent reaches $4,318/month
This 60% difference significantly impacts investment returns. Use LeaseBase's Analytics & Reporting module to model long-term rent growth under local caps and plan repairs, upgrades, or portfolio diversification accordingly.
Disclaimer
This article is for informational purposes only and does not constitute legal advice. Consult a qualified attorney for guidance specific to your situation. Rent control laws change, and individual circumstances vary. Always verify current ordinances with your city's housing department before implementing rent increases.