I had not heard of the corporate housing by owner site.

This means you can sell, lease, or pass on the property as you see fit, just like any other property owner.Full Ownership RightsYou have the same rights as a Mexican property owner, including the ability to sell, lease, transfer, or mortgage the propertyLegal SecurityThe Bank Trust is a well-established legal mechanism in Mexico, ensuring your investment is secure and protected under Mexican law.Renewable TermsThe trust is set up for 50 years and can be renewed indefinitely, allowing you and future generations to maintain control over the property.Estate PlanningThe trust makes it easier to pass the property on to heirs, simplifying the inheritance process and reducing potential legal complications.Although the process might initially seem complex, it is entirely managed and supervised by a reputable banking entity.

HELOCs are generally provided to properties that are held in the owner's personal name.Are your family members not interested in refinancing the property?

@Brett Coultas if you're a newbie, you want to be careful of an "investor friendly" agent selling you something they truly don't understand:(95+% of agents only know how to handle owner-occupied transactions - you can verify this by asking them calculate ROI for you or Cash-On-Cash!

Quote from @Fernando Martin-Gullans: Hey y’all, I’m a retail investor with 2 SFH rentals worth a combined ~$650k looking to utilize some of my stored equity to buy more out-of-state properties, but I’m not quite sure how best to proceed given that my interest rates are incredibly low (leaning me away from refinancing) and neither property is owner-occupied (which I believe prevents me from using a HELOC).

So he bought up several owner financed properties that offered 0% down, and he cash flowed. 

Know this first:  the #1 reason that landlords fail is their failure to manage to the lease (American Apartment Owners' Assn). 

Our area has a good selection of hard money lenders, and every now and then, you might find an owner willing to carry the loan, often at attractive rates.

Some companies allow property owners to select tenants and set the screening criteria...We do not - our criteria does not bend. 

We spend far too little time looking for small multi-family deals in this area for the reasons you listed although we would look closely at an off-market (perhaps owner financed deal).