I worked out a spreadsheet of sold houses that we want to find the final prices on. I did this so I could ask one of our real estate agents to fill in the missing stuff. I ended up writing code to extract it from MLS.
In retrospect, I realize that this would be the right approach to asking a favor of a coworker you’re working with. If you’re paying someone, which we are, I think the right thing is to vaguely describe what you want and let them work it out.