Isabella, the majority of commercial property developments are structured a LLC's. I would start by setting one up with an attorney. Once you have a legal entity to reference in your business plan then you can go through the process of writing one. There are a multitude of business plan resources out there including services who will write them for you. I don't recommend this route for your first time since the process of writing one teaches you a great deal about the business you’re working to built. The first place I would go is the SCORE website SCORE "Counselors to America's Small Business". That should get you off to a good start. You should also search the forum for prior post, I’m sure there are a bunch on this topic.
I feel sorry for the person who can't get genuinely excited about his work. Not only will he never be satisfied, but he will never achieve anything worthwhile.
Walter Chrysler