The other allegations are not factual.Then, Mr Reynal sends me emails insisting that I buy his duplex back for 20k more than I sold it to him for under the threat of impending legal action.

Threaten to sue the agent and the seller if they don't return your earnest and void the contract because they breached it.I think you could actually win on this basis, but usually just the threat of a plausible winning lawsuit is all it takes, in my experience.I have great luck getting folk to settle with a tough bluff backed by a potentially winning case.

@Roshan K. is exactly right - treat the daughter exactly like you would want to be treated - or to drill down even more, threat her exactly the way you would want YOUR daughter treated in the same situation.In addition to the PR hit you'll take if you enforce the guarantee, you'll have to figure out how to keep your own conscience from screaming bloody murder at you in the middle of the night.

The only way it would help your cause is if she acted on your threat and moved on.

Perhaps a visit to the water company together for a scheduled appointment with a supervisor is best, but don't know if this is feasible with the coronvirus threat these days.Whatever balance is outstanding after all these efforts I would probably propose to the tenant to split it after pointing out the clause in your lease.

Typically the threat of filing a complaint with the regulatory agency will make them realize their mistake.  

Threats were flying from both sides and the cops were called.

According to the Fair Housing Act and the Americans with Disabilities Act:Even if a landlord has a no pet policy in place, the law does not consider service animals as pets and therefore the service animal is exempt from such a restriction.Service animals are allowed anywhere a person would go, including food areas that would normally restrict an animal’s presence.Landlords cannot charge a pet deposit or pet fee for service animals, however the tenant is liable for any damage that the service animal may cause.Landlords can require written verification from the tenant’s health care provider that they are disabled but cannot ask for any specifics about the disability.Landlords can require written verification from the tenant’s health care provider that the service animal is needed.Landlords can request copies of the animal’s health records to prove the animal is in good health, parasite-free and immunized/vaccinated.Landlords can write warnings or even evict a tenant with a service animal if the animal is disturbing others, posing a threat to others or causing considerable damage to the property.In other words, you can ask for appropriate paperwork concerning the tenant’s need for the service animal and to verify the animal’s health. 

We've been marketing to try and attract the 1-6 month rental range and have had great luck in attracting residents in the Cyber community.  

The threat of eviction works for me but I don't know how your court system works or how savvy the tenant is.