The biggest 'danger' I've experienced in the coaching space was coaches who took the cash and wanted me to follow 'their' program rather than coaching me where I am to get where I wanted to go. 

That will allow you to build the additional legal space further amplifying the value of the proprety (more HELOC money). 

I've got a mixed use building with a vacant 5200 sg ft. medical space on the first floor.

Are you currently in the STR or LTR space / are you looking to expand into one or the other as you grow your portfolio? 

This residence features 3 bedrooms and 3.5 bathrooms, encompassing approximately 1,700 square feet of living space.

@Jonathan LudizacaFrom a lender's perspective, starting in 1-4 units gives you experience and many more lenders will be open to first time flippers in this space versus multifamily. 

With commercial office space starting to return, I am interested in establishing a syndication group that would be willing to invest capital into commercial office buildings.

Find parks in the area that have open spaces for mobiles then negotiate with the park owner for 6 to 12 months free space rent or for them to pay the moving costs. 

Commercial Property Rental: How viable is investing in commercial spaces for steady income?

And via the clustering we are utilizing green-space in a communal manner thus reducing foot-print of that BUT retaining such perception as each unit has walkout to what seems a BIG green space.