They took occupancy immediately after the previous owners the day after the walk through as they were acquainted with them and applied to my management company.

Then Interior community walk ways? 

I recently bought my first house as primary residence but walked in with instant equality of 6.5%!

I also schedule my own walk-through inspection within a week of purchase so I can take pictures to document condition, ask the tenants about any deferred maintenance, or to discuss any pending changes.

This property has houses around it and 2 businesses within walking distance to it, and the plans are to build another business a couple of hundred feet away from it.

I always take my valuable tools and equipment with me at the end of the day but I still worry about walking into the project the next morning and seeing my supplies cleared out. 

Should I send them a contract that has both properties for a certain price to show im serious, should I just stick to verbal, or should I just walk away.

You should definitely have an inspection and appraisal contingency as a first time home buyer, but you could always include an inspection as "purely informational" meaning that you can still walk away if you find something in the house, but you will not negotiate given what is discovered.

So it is not exactly a walk in the park for me and I’ve been doing it for years.

Maybe since it’s your first one, ask a local investor to walk through the process with you if you’re unsure?