Jon Pacitto to me there is a macro and micro analysis that needs to be done.

And if possible, I'd do a few drive-throughs at different times of the day to see if it's noisy.  

Every complex she rented was very noisy and the managers never did anything about it. 

Construction guys are noisy.  

If a tenant was noisy or had friends taking up all the parking spaces, or they were smoking in the apt, etc., it would affect other tenants, and we didn't want to lose good tenants.If we ended up with a problem tenant, we could just give them 30 days notice to leave (60 days, if they're been there over a year in CA).  

I'd just tell the noisy tenant that I heard them.What your dad could say to the long-time tenant is, that he'll look into it, but if the tenant is concerned about his safety, etc., he should definitely call the police.Another thought would be to ask the other tenant in the building if they've had any concerns about the new guy.  

There are also lots of people that live in commercial buildings above or next door to some noisy business.

Which were noisy, caused tons of problems with new needed maintenance and everyone losing their remotes.  

They and their frequent guests at all hours are making excessive noise and disturbing the other tenants.Then, after three days, serve them with an unlawful detainer, because their noisy ways continued.Here's the CA court website that has all the info and forms you need:http://www.courts.ca.gov/selfhelp-eviction.htmHere's the page specifically on the different types of 3 day notices:http://www.courts.ca.gov/27810.htmYou can show up to eviction court with solid proof of dates and times of guests and any police calls, etc., from your surveillance camera.  

.- - - - - - - - - -PET AGREEMENT  (Addendum to Rental Agreement)The Month-To-Month Rental Agreement (the “Agreement”) dated_______________________ between __________________________________________________________________________, as Landlord and ________________________________________________________________________, as Tenant of real property located at _______________________________________________________, is hereby amended to include the following terms and conditions: The rental agreement specifically prohibits keeping pets and animals without Landlord permission; Tenant agrees to follow these terms and conditions in exchange for permission to keep a specific pet:Condition for keeping a pet:Tenant agrees to pay additional rent of _____________ per month for the privilege of keeping this pet.Tenant agrees to pay additional security deposit of ______________ for the privilege of keeping this pet.Name of pet: __________________________Description of pet: _______________________ (type, breed, color, age)Veterinarian: __________________________Emergency Caretaker: ____________________Tenant agrees to:1.Provide proper care for the pet in accordance with veterinary recommendations or ASPCA (American Society for the Prevention of Cruelty to Animals) guidelines.See www.aspca.org.2.Adhere to local ordinances, including leash, vaccination, and tag/licensing, requirements.3.Clean up after the pet and dispose of pet waste properly and quickly.4.Not to leave pet food or water outside the dwelling, as it could attract other animals.5.Not to leave the pet unattended for any unreasonable periods of time.6.Keep the pet from being noisy, aggressive, or from causing any annoyance or discomfort to others.7.Immediately remedy any complaints that arise from pet behavior.8.Immediately pay for any damage, loss, or expense caused to others by the pet.9.Provide pet with regular health care, to include inoculations as recommended by a veterinarian.10.Spay or neuter the pet when it becomes of age to do so.11.Arrange for an emergency caretaker for the pet.Tenant agrees to indemnify, hold harmless and defend Landlord against all liability, judgments, expenses (including attorney fees), or claims by third parties for any injury to any person or damage to property caused by Tenant’s pet.Landlord reserves the right to revoke permission to keep the pet should Tenant break this agreement or provide false or misleading information.