Being a Realtor and a Property Manager for over 30 years, and the need for the internet we all have, but if your TENANT is having problems with her accessibility to Netflix, this is not your problem as a landlord, you have provided the service and have made sure that the service works on multiple occasions, if she needs something else stronger then I would suggest you let her and her helicopter father know that you have complied with the lease and if they feel the need for additional technology to access what she needs then they can call the Geek Squad and get a booster. 

On the HUD website it says only that: At least 80 percent of the units must have at least one occupant who is 55 years of age or older; andThe facility or community must publish and adhere to policies and procedures that demonstrate the intent to operate as "55 or older" housing; andThe facility or community must comply with HUD's regulatory requirements for age verification of residentsThis all seems a bit too easy to me, but can't really find step-by-step directions anywhere to do this.

Just sent my first Notice to Comply with Lease Agreement after 3 quiet years.What should be my next step if I come in 14 days to review violations fixed as per the Notice yet the tenants are no show?

Could the buyer be held accountable to retroactively comply with this Act?

For example, a small business does not need to comply with the Washington collection agency law when the its owner contacts you regarding a debt (assuming it is not in the debt collection business, of course).

Turn over and make readys slow to a crawl,However, there are a lot of caveats to comply with when you say "no kids" not sure what they all are so if anyone knows those rules, it would help this thread out a lot 

We sent out a notice to all tenants to comply.

Im not certain how to make a purchaser follow the sales contract on property that I am selling to them.  The real estate attorney who drew up the contract for the sale included that the buyer had to acquire insurance ...

You can reduce the rent to comply.  

Have you tried to send a Notice to Comply or vacate letter to your tenant?