& utilities for 3-4 guys with jobs and no pets or smoking.

Serve her with a notice that she's in violation of the lease by having a pet living on the premises. 

Renting for $950/mo (+pet rent)End result is ~$200/mo cash flow for ~10% CoC return on the ~$24k left in the property (nb: I've wondered what the "Cash invested" field in this form is intended to refer to, I think folks interpret it differently.

I totally agree with you, and to add to your pointers, they also tend to keep most (if not all) of the additional income (late fees, pet fees, etc), charge one month’s rent for every new tenant, a fee to renew all the leases every year, and so on...I have had great and bad experiences and all that was mentioned has happened to me.

(For example 70% of renters here have pets.

The entire house was filled with trash, pet urine all over the carpets, and the toilets were filled with feces.

I'm considering charging a $20-25 monthly laundry fee (similar to a pet fee), has anyone ever done this and are there any restrictions?

Here's a list of what we ask for in our LOIs and contracts:Operating financial statements for the property, including income statements, expense statements, capital expenditures, for the last two years of operation and year-to-date financial statements for 2020.Prior two (2) years tax returns and addendums for the Property.Current tenant leases, tenant correspondence, tenant credit information, tenant security deposit register, and delinquency report.Onsite staff payroll records to include salary, bonuses, payroll taxes, benefits, etc.Monthly owner statements and rent rolls for the past 12 months.Contracts, service agreements, and files pertaining to the property.List of maintenance all maintenance requests (complete and incomplete) for the last two years of operations.Real estate tax billings and assessments and other correspondence pertaining to real estate tax calculations at the property.Copy of Insurance Policy and claims documentation (loss runs).List of capital improvements and any and all necessary related documentation and warranties.All existing warranties and guarantees from architects, contractors, and material and equipment suppliers, all of which would be assigned to Purchase.Any existing environmental Phase I/II reports, engineering reports, soil, mold, radon, asbestos, hazardous substance, termite, or other tests, studies, or reports.Any existing appraisals.Itemized inventory of all personal property.Twelve (12) months of utility, water and sewer bills.Twelve (12) months of bank statements.Verification of additional income from operations including but not limited to application, pet, late, and other fees, etc.Copies of title policies, title reports, land surveys, site plans, deeds, or any architectural plans for the property.History of or pending litigation against the Property, its owners, or its managers related to the Property or the operation thereof.Such additional information, documentation, or access as Purchaser shall require

Is it up to the landlord to inform the tenants about pet registration with the town?

. Pets are not allowed.