Builder's deal?

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Hi

A buddy who is my neighbor in a commercial building. I have a retail store, he has a mortgage brokerage office.

He has this deal he told me about.

A builder he knows has 6 brand new residential properties in an affluant part of a Detroit suburb. The average price of each is $700K

The builder wants to sell them all or individually at market price and give a check back at closing for 75K to 100K per house.

In other words there is instant equity.

Question.

.1 Is this common place?

.2 I do not have the means to acquire these at the moment nor do I have them under contract. Is 10% of the equity a reasonable fee for a finders fee?