I priced the seller's own lease like it was arm's length. It wasn't.
Small town, population about 4,200, an hour from anything. 11,000 sf building, half storefront retail and half warehouse, three tenants. Rent roll said $86k gross, expenses about $24k, so I'm at $62k NOI. Contract at $690k, which is a hair under a 9. Plan was to assign around $735k to one of the two rural buyers I'd been talking to for months.
The seller occupied 6,000 sf of it with his own parts business at $9/sf triple net. Everything else in that town leases at $4 to $5/sf if it leases at all, and there were two empty storefronts on the same block. He'd signed himself a ten year lease three weeks before listing it.
My buyer stripped that rent to market on the first pass. NOI goes from $62k to about $41k. He'd only go to a 10.5 in a tertiary market with no depth, so $390k. Then he asked for a personal guarantee from the seller behind the business lease and the seller flatly refused, which told everybody what the lease was worth. The second buyer never even got that far, his lender wouldn't quote a building where 55% of the income came from the seller (I'm told that's common, but confirm with your own lender because every one of them writes it differently).
Dead at day 34. $2,500 earnest, got $1,250 back after some arguing, plus $1,900 in travel and an environmental questionnaire I paid for.
What I'd change: any related party lease gets marked to market before I sign, full stop. And I'd ask for the guarantee question on day one instead of letting a buyer discover it for me.