Note It is an old brick  building with old school foundation that had a few inches flooding on the 1st level recently that needs to be repaired thats why I'm weighing all my options.All advice welcome thx

I’m also currently working for GC on the management side so I like to think I have a good foundation to build on.

But a SLAB foundation.. whats your thoughts on that vs a basement / Crawlspace setup for a duplex rental?

Highly recommend getting additional inspections (termite/mold/foundation/roof) if needed to assess the condition. 

Be there PAID assistants that's where you will learn and create a much better foundation for yourself than trying to read on line and BP s 10k different view points.. 

FYI - Its going to be an ADU from the ground-up since the existing garage foundation may not work for the ADU.  

Don't get into real estate until you have built this foundation.

The two main issue with the property are large cracks in the brick basement walls and foundation issues both from settling.

Thanks to all of you have who have already posted recommendations for property management companies and foundation repair companies!

Here's the link for it  https://www.eventbrite.com/e/momentum-meetup-patten-law-firm-greentree-foundation-tickets-29312708099