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Credit Card Points from Refund
Because your friend isn't going to like the ~2% charge they have to pay to the credit card company on the $10,000 purchase. Credit card companies make money off of transactions. The cardholder normally doesn't pay any transaction fees (and in fact can make a profit via rewards), but the merchant has to pay a certain amount of money to the credit card company for the transaction. In this case, the apartment owners ate the charge, likely because it was easier for them to send a check than to refund the cost of the fee through the credit card company. If you started doing this a lot to take advantage of this, I would imagine they would get smart and refuse your business (it'll be pretty obvious what you're doing if you're not signing any leases).