Problem is normally builders do this because the profit is in selling both. You're going to be hiring a building and their money is going to come from any profit you make on selling the other.
Based on the nature of questions you've asked, I do not suggest you do it as the prime contractor.
"so I can have some design influence", you think when you hire a builder they just build it based on some spec design and don't let you make any changes?
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