He needs a pre-approval letter just to show you T12, rent roll, etc? Maybe since he is a residential broker he is not accustomed to sending out NCND/Confidentiality Agreements.
There seems to be some differing opinions here. How could the buyer have a pre-approval letter that applies to every asset he looks at? I look at MF deals of varying check sizes all the time. I am absolutely not pre-approved to close these deals myself. Your average General Partner/Sponsor will raise 90% of the required equity through a limited partner to buy a $10 million dollar apartment building. The general partner is not approved to buy the deal himself. What if you look at different asset classes? What if you have a consultant like me do your underwriting? Do I have to be pre-approved?
If you have to be pre-approved and share all your info for every deal you want to underwrite, you're not going to be able to underwrite enough deals and have a full deal funnel.
I've never had a commercial broker ask for anything other than a CA to be executed before underwriting the deal. If it's a $100,000 single-family property, then I always have to show POF. That's different.
It takes 2 minutes to send the Due Diligence vault over. You're not a tire kicker for wanting to check the deal out. Now if you inspect the property/bring the broker out there with no way of closing, then you're a tire kicker.