if its only one sub it could have been an oversight. 3 years  is this because permits take so long..

It will familiarize you with the basic terminology and benefits.

Its at a ski resort so it seems like it would be time consuming.

Managing tenants yourself is no small task, but I’d say it’s often a blessing in disguise.

I understand I cannot legally require them to respond, unless the notice specifically requires it, like for instance, a notice of entry, but it's making it difficult to manage the property, and I'm not sure how to proceed.

If I have lump-sum free cash, should I just apply it to my mortgage to recast so that my monthly goes lower?

If I can grab a quality location, 5.3 cap all cash right now I do it.

You can also consider converting yourself.

I plan on mailing the letter certified and I wanted to know do landlords also call the tenant as a courtesy to let them know about the letter. 

If I can do it, you can do it!