My main suggestion would be to partner up. 

Are most Vendors who Supply & Install Licensed, Bonded, Insured in the same manner as GC's?

I could tease this out more, but the main reasons are 1) a down economy, 2) an emerging economy, 3) AAA property locations, 4) lack of credit available, and 5) historical buildings (very sturdy construction, 3-4.5m ceilings, etc) that are very undervalued at the moment for mostly aesthetic reasons that can be fixed quite easily.

They could not supply this to me.

After that we have mainly leveraged ourselves.

The end report indicated a need for fixes, some just based on common knowledge would be a simple home depot run for supplies to re-grade so as to stop future problems, others, possibility of helical piers which just from structural engineers rough estimate as he did do similar work in the past, would have been a significant cost. 

They are in a small city but on the far edge of the main part of the city.

This should include the main beams, posts, and floor joists.

Mainly because of the higher turnover, higher vacancy, more hands-on property managing experience you typically hear about.

As you take over that 6-unit, and frankly with any property you acquire, always be looking at how you can improve the value of the business.  2 main ways to add value.