Treat it as an operations problem, not just a nuisance
The complaint usually arrives like this:
"There are people who do not live here using the basketball court every night. They park in our spaces, leave trash, smoke by the building, and my kids cannot use the court anymore. Can you do something?"
If you own one rental house, this might be strangers cutting through the yard. If you own a triplex, it might be guests taking assigned parking. If you own a small apartment building, it might be non-residents using the laundry room, gym, pool, courtyard, storage area, or playground.
Your first instinct may be to ask, "Are they guests of a tenant?" That matters, but it is not the first question.
The first question is:
Is the property being controlled in the way the lease promised and the insurance assumes?
Shared spaces are part of what tenants rent. If outsiders regularly take over those spaces, your tenants lose quiet enjoyment, your maintenance costs rise, and your liability picture gets uglier. A broken bottle on the court, a fight in the parking lot, or a stolen package is not just "kids hanging out." It is a management failure if you knew about the pattern and did nothing reasonable.
Start by separating guests from trespassers
Do not jump straight to calling everyone a trespasser. Some of the people may be legitimate guests of tenants.
Sort the issue into three buckets:
- Normal guests. A tenant invites a friend over to shoot hoops for an hour or use the grill during a birthday party.
- Guest abuse. A tenant's guests are effectively treating the property as their own hangout, creating parking problems, trash, noise, damage, or safety concerns.
- Non-resident trespass. People with no connection to a tenant are entering the property and using amenities, parking, or common areas.
The response is different for each bucket.
Normal guests are part of residential life. Guest abuse is usually handled through the lease and tenant communication. Non-resident trespass may require access control, signage, police non-emergency calls, towing enforcement, or attorney guidance depending on your local rules.
The mistake is treating all three the same. If you ban all guests, you overreach. If you ignore obvious trespass because "maybe someone knows them," you abandon control of the property.
Gather facts before sending threats
You need enough information to act without guessing.
Ask the reporting tenant for specifics:
- What days and times is it happening?
- Where are people entering from?
- Are they using a specific amenity, parking area, doorway, gate, or building access point?
- Are any vehicles involved? If so, what license plates or descriptions?
- Is there trash, damage, smoking, alcohol, noise, blocked parking, graffiti, or threatening behavior?
- Do they appear to be visiting a specific unit?
- Has anyone been told to leave, and how did they respond?
Ask for photos or video only if the tenant can collect them safely from their own unit or common area. Do not encourage tenants to confront strangers, follow people, or put themselves in the middle of an enforcement problem.
Then inspect the property yourself or send someone you trust. Look for:
- Broken gate latches, propped doors, or missing locks
- Parking signs that are absent, faded, or unenforced
- Amenity rules that are not posted
- Trash accumulation, graffiti, smoking debris, broken glass, or damage
- Exterior lighting gaps
- Fencing gaps, easy cut-through paths, or unsecured side entrances
- Cameras that are missing, broken, pointed at the wrong area, or not recording
This step matters because sometimes the "people problem" is also a property-control problem. If the laundry room has a keypad code every former tenant still knows, you do not have a tenant discipline issue. You have an access issue.
Fix the easy property-control failures first
Before you write a stern letter, make sure the property is not inviting the problem.
Basic fixes often include:
- Rekeying shared doors after turnover
- Changing keypad or gate codes when tenants move out
- Repairing gate latches and door closers
- Adding clear "residents and guests only" signs
- Posting amenity hours and rules
- Marking assigned parking spaces
- Adding towing signs only after confirming local requirements
- Improving lighting in parking and amenity areas
- Removing abandoned furniture, trash, or items that make the space feel unmanaged
Small landlords sometimes skip signage because it feels too commercial. Do not. Clear rules help tenants understand expectations and help you enforce them consistently.
A sign does not need to be aggressive:
Basketball court is for residents and their invited guests only. Hours: 8 a.m. to 9 p.m. No smoking, alcohol, glass containers, littering, or amplified music. Guests must be accompanied by a resident. Violations may result in loss of amenity privileges or enforcement under the lease.
For parking:
Private parking for residents and authorized guests only. Unauthorized vehicles may be towed at owner's expense where permitted by law.
Before towing, check your state and local rules. Many cities require specific sign size, placement, wording, towing company information, or notice procedures. Get that wrong and the tow can become your problem.
Put guest and amenity rules in writing
If your lease says nothing about guests, parking, common areas, amenity hours, smoking, noise, trash, or damage, enforcement gets harder.
Your lease or rules addendum should cover:
- Who may use shared amenities
- Whether guests must be accompanied by a tenant
- Amenity hours
- Parking rules, permits, assigned spaces, and guest parking
- Prohibited conduct such as smoking in common areas, littering, vandalism, harassment, blocking access, or excessive noise
- Tenant responsibility for their guests' conduct
- Whether repeated violations can lead to fines, loss of amenity access, non-renewal, or other remedies allowed by law
- How tenants should report safety concerns
The key sentence is usually some version of:
Tenant is responsible for the conduct of Tenant's guests, invitees, and occupants while they are on the property, including in parking areas and common areas.
Do not rely on that sentence alone. It is stronger when paired with specific rules the tenant can actually follow.
If you already have leases in place, you may not be able to unilaterally add major new obligations mid-lease. But you can often send a rules reminder that restates existing lease duties, and you can update your lease package for the next renewal or new tenant. For significant changes, ask a local attorney or use a state-specific lease form.
Communicate with tenants without deputizing them
Send one calm building-wide message if the issue affects multiple tenants.
Example:
We have received reports of non-residents using the basketball court and parking areas, leaving trash, and occupying resident spaces. The court and parking areas are for residents and their invited guests only. Guests must be accompanied by a resident and must follow posted rules. Please do not confront unknown individuals. If you see unsafe activity, contact local authorities if appropriate and notify management with the date, time, location, and any vehicle description.
That message does four useful things:
- Confirms you are responding
- Reminds tenants of the rule
- Tells tenants not to play security guard
- Gives you better incident reports
Avoid messages like "Residents need to handle this among yourselves" or "Just tell them to leave." That shifts your management problem onto tenants and can escalate a situation they are not trained to handle.
Handle tenant-connected guest abuse through the lease
If you learn the same tenant is repeatedly inviting large groups who monopolize an amenity, block parking, leave trash, or damage property, address that tenant directly.
Keep the first message factual:
On May 18, May 20, and May 22, multiple guests associated with your unit were observed using the court after posted hours, leaving trash, and parking in spaces assigned to other residents. Your lease makes you responsible for guest conduct in common areas. This needs to stop immediately. Future violations may result in formal lease enforcement.
Attach photos, incident reports, or parking records if you have them.
Do not exaggerate. Do not call them criminals. Do not threaten eviction as your opening move unless the conduct is severe enough to justify it under your lease and local law. You want a clean record showing notice, facts, and a reasonable opportunity to correct.
If the conduct continues, follow your lease and local process: formal notice, fines if lawful and allowed, restriction of amenity privileges if your documents support it, non-renewal where permitted, or legal action for serious violations. Keep fair housing in mind. Enforce the same rules the same way regardless of who the tenant is, who their guests are, or which neighbors complain the loudest.
When strangers are actually trespassing
If people with no tenant connection are using the property, your plan is more about access control and documentation.
Practical steps:
- Post clear private-property and resident-only signs.
- Secure obvious access points.
- Keep incident logs with dates, times, photos, and vehicle descriptions.
- Use police non-emergency lines for recurring trespass, vandalism, threats, or after-hours activity.
- Give law enforcement the information they need to identify you as the property owner or authorized manager.
- Work with a local attorney if you need trespass authorization forms, no-trespass letters, or repeat-offender enforcement.
Some police departments allow property owners to file a standing trespass authorization so officers can act when non-residents are on the property after hours. Others require owner or manager presence. Rules vary widely, so ask locally instead of assuming.
For larger problems, consider a licensed security patrol for a limited period. That can be expensive, but a short burst of visible enforcement sometimes resets a property that has become a neighborhood hangout.
Do not create a bigger liability problem
There are a few tempting responses that can backfire.
Do not ask tenants to confront people. You can ask for reports. You should not ask a resident to remove strangers from the property.
Do not install cameras casually. Cameras can help, but place them in common areas only, avoid recording private spaces, post notice if required, and understand audio-recording laws before capturing sound.
Do not tow without a compliant towing setup. Unauthorized parking is maddening. Illegal towing is worse.
Do not lock amenities in a way that blocks required access. A gate, laundry room, pool, or courtyard may have fire egress, accessibility, or habitability considerations.
Do not enforce selectively. If one group gets warnings and another gets fines for the same conduct, you are creating a fair housing and tenant-relations problem.
The goal is not to make the property feel hostile. The goal is to make it feel managed.
Add this to your next turnover checklist
Non-resident use is easier to prevent than to unwind.
At each turnover:
- Collect all keys, fobs, remotes, permits, and parking passes
- Rekey or re-code shared access where practical
- Remove old tenant names from directories, call boxes, and access systems
- Cancel old gate, laundry, gym, or amenity credentials
- Reissue parking permits and guest passes
- Photograph common areas and posted rules
- Confirm exterior lights, gates, locks, and cameras work
- Remind the incoming tenant of guest, parking, trash, smoking, and amenity rules
For small buildings, the weak point is often old access. One former tenant gives a gate code to a friend, the friend gives it to two more people, and six months later the parking lot feels public. Change codes before the property teaches the neighborhood that nobody is watching.
The landlord answer in one sentence
When non-residents take over a shared rental space, respond like an operator: document the pattern, secure the property, clarify rules, communicate calmly, enforce tenant-connected guest abuse through the lease, and use local trespass or towing procedures only when your setup is legally ready.
If you want one place to keep tenant reports, incident notes, lease rules, photos, and maintenance follow-up tied to each property, ManorKeeper helps self-managing landlords keep the paper trail organized. See how it works.