The short version

Start with the source
Odor from tenant operations, shared mechanical systems and building structure are often treated differently in a lease
Read these clauses
Repairs and maintenance, common area maintenance, HVAC, hazardous materials, use restrictions and alterations
Document first
Dates, locations and observations carry more weight than general complaints
Not legal advice
A real estate attorney can say what a specific lease means

Why the answer is rarely automatic

Commercial leases are negotiated documents, and two suites in the same Westminster office park can have quite different terms. Many leases are written on a net basis, where the tenant carries more of the maintenance burden inside the premises, while the landlord keeps the roof, structure and shared systems. Odor does not fit neatly into those categories because a single smell can start in one place and travel to another.

A sewer smell from a dry trap inside a suite looks like a tenant maintenance item. The same smell from a failed seal in a shared building drain looks like a landlord item. Cooking odor from a restaurant next door moves through a shared plenum, and the question becomes whether the neighbor's lease, the building design or the mechanical system is at fault. That is why finding the source comes before assigning cost.

Where cost and control often land

Typical patterns, not rules. The lease governs.

Often the tenant's side

  • Odor created by the tenant's own operations, products or waste
  • Drains, sinks and fixtures serving only the suite
  • Thermostat settings and after-hours schedules the tenant controls
  • Cleaning of tenant-installed finishes and equipment

Often the landlord's side

  • Roof, rooftop units and shared ductwork or plenums
  • Main building drains and vent stacks
  • Water intrusion through the roof or exterior walls
  • Common areas and the condition of a suite at delivery

A sensible order of operations

  1. Pull the lease and every amendment

    Mark the repair, HVAC, use and alteration clauses and any exhibit describing the condition of the space at move-in.

  2. Record the problem

    Keep a dated odor log and photographs of any stains, stained ceiling tiles or open drains.

  3. Notify in writing

    Send a dated message to the property manager describing what, where and since when. Follow whatever notice method the lease names.

  4. Ask for a joint walkthrough

    Having the tenant, property manager and a mechanical or plumbing contractor look at the same spot avoids two competing stories.

  5. Agree on the next test

    A small, inexpensive test, such as refilling traps or shutting off one unit, often narrows the cause before anyone commits to larger work.

Common questions

Can a tenant stop paying rent over an odor?
That depends on the lease and local law, and acting on a guess can create a bigger dispute. Talk with an attorney before withholding anything.
Does a strong odor affect a certificate of occupancy?
Usually not by itself. If an odor suggests a health or safety hazard, the city building department or county public health agency is the place to ask.

General information for Westminster, not a quote or professional advice. In an emergency, call 911.