Depending on the size of your project and how strongly you need your partner's credit rating to get the needed loan, a reasonable percentage to offer will be in the range of 3% to 5%.
By hiring a real estate agent, you will be able to take advantage of his expertise in certain situations, such as when drawing up a buy/sell contract.
Most banks are also known to turn down unfinished home mortgages that they feel will have trouble selling in the event that you default.
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