I would just evaluate the exterior in comparison to other recently sold properties to ensure it is on the same level.

I wasn't, because the list was ridiculous with stuff like screwing in a loose outlet and having a licensed electrician verify that repair, or having a licensed plumber look at the garbage disposal to ensure it's sealed.

While upgrades certainly give you more curb appeal and a potential advantage over the competition you need to ensure you are not putting too much into a home. 

In that case, you need to consult an attorney to ensure you comply with the state law and your governing docs.

There are lots of free resources that track supply and demand data like CBRE, MFN, Housing wire, Zillow etc.

If this is relevant for your market and operations: Assume that you will take home 1/3 of the commissions earned from a sale (which BTW is more like 2.7% per sale, NOT 6%, and really not 3% if you're taking the long view of the data). 

I know they have loads of data and there is a business reason they are doing that.

This data was collected from the US Census, which conducts a monthly building permit survey for every US metro. 

You need to find several other contractors to bid this, and ensure they’re licensed, insured, and fully vetted with good references.

Do your DILIGENCE and use their "urgency" as a negotiating lever- If the seller requests to move-out after the closing date, be sure to hold half of their profits with the closing attorney to ensure they move out on the agreed upon date- Visit the home frequently.