Mortgage/ Promissory note for private investor

[Michael Williams]

Looking for an example mortgage/ promissory note for private "family" investors. I have a family member whose willing to invest with me to purchase my first apartment building, they want monthly payments for 2-3 years until I'm able to refinance to property and pay them back in full. Should I contact a lawyer to draw up some kind of contract or are there templates I can use for real estate private investors? I will still have a lawyer review everything to make sure it's all legal, and does it vary by state?