I let a friend stay in our rental for the last nine month for a discounted rent to get on his feet.

The concept of BRRRR is to acquire at deep discount, force equity through renovation, and then pull that equity by placing debt on the property.

The investor is making a one-time purchase (no volume discount) that is PRE-rehab. 

There are some undervalued properties in some less known towns, but even in those mid sized cities like Povoa de Varzim and Vila do Conde the prices are way too high.Unless you are considering doing AirBnb, pretty much, exclusively.

If the owner of the tax lien has not foreclosed on the property offer to buy their lien at a discount.

People discount the value of perpetual education because they are unaware of the importance of emotional balance in business. 

The HOA is high because it's in a gated community with a lake with several beaches and playgrounds, a community pool, a golf course with super discounted rates, an equestrian center and archery/shooting range, as well as hiking trails. 

Mom and Pop operation, used to use Zillow pretty much exclusively. 

I purchase at a DISCOUNT.  

Agree maybe walk away.If you choose to continue, maybe give the seller a discount for delivering vacant, offering the current tenants cash for keys, or something similar.