As long as it is your primary residence and you aren't renting it out when you are not there, you will be fine.

Hi All,I am looking to convert the basement into an ADU hence I will need to interact with local authority in order to obtain the building permit.

My rule of thumb is, if you have to ask if they are legit then they probably aren't.

First off, you should know that getting a loan as a foreigner in Mexico is quite difficult—most traditional lending options aren’t available, so you’ll likely have to explore alternative financing or fund the construction yourself.When it comes to managing the property as a short-term rental, you'll need to decide whether you want to open a small company in Mexico.

Credibility and competence simply validate that choosing you was indeed the right choice.People do business with people they like.With an amazing personality, people will find reasons and excuses to work with you, even if you're not an authority in this space.On the other hand, if you’re a complete jerk, people will find reasons and excuses NOT to work with you, despite you being an authority in this space.So what we’ve done is make sure that GrumpyHare websites, out-of-the-box, show your traffic immediately who you are, what you’re like, and what it would be like to work with you—all aligning with the traits a motivated seller is looking for in a cash buyer.This is what I call the Conversion Psychology of Motivated Sellers.And this is the core engine of GrumpyHare.The result?

Your replies aren't even about the issue at hand.

Expenses that exclusively relate to the rental unit are 100% deductible, shared property expenses (like mortgage interest, insurance, and common area repairs) are typically 50% deductible, and personal residence expenses aren’t deductible. 

I believe this market cycle is topping, and one should tread very carefully before investing more money into an 'unsure' property.That does NOT mean to stop investing; just make sure you aren't trying to catch a falling knife in an unsure environment. 

There really aren't any agents that do just leasing for people of residential homes 

The best way to build relationships with cash buyers is to establish yourself as an authority in this space.