I have hired an architect, structural engineer, env p1 study, and so far the analysis looks good. 

Revenue Management, their algorithm seems to under price your property.

I would find a GC or local engineer that is willing to do just construction management. 

There’s a canyon-sized difference between a reno or new build that looks nice, and one that is strategically engineered to be a magnet for A+ tenants or top-dollar buyers. 

There is a reason a Finance Degree or Engineering Degree takes years, YEARS to obtain, not months, weeks or hours.

The seller paid a structural engineer to inspect the basement and provide a report for us to review.

Have you had an engineer review this?

Do not give your traffic ANY reason to leave your website.If they click on your social media, and go to Facebook, and see their messages, likes, comments they get distracted, and Facebook algorithm knows this person just visited a "we buy houses" website, and Facebook now will display all your competitions ads to that prospect, hence giving away your prospects away on a silver platter.

Like some people have mentioned here: interview for agents that know what they are doing, that know investments, that know how to get ARVs , that know how to assess renovations, construction costs, etc A realtor that has this experience will have a team also: Think Contractors, Architects or drafters, Interior designers, Engineers, inspectors, title reps, and they will also already have whole sellers they have worked with in the past, know how to get direct to seller off market homes for you, hard money lenders or other avenues for cash like offers.

This would be an instance for stepping in a creating a short-term "bridge", not to replace but to BRIDGE the gaps that were created from the sudden loss of parts and pieces from the economic engine.