They vary in range but just to give you a reference

Down payments vary, but 15% or more is often recommended.

Just keep in mind that construction costs can add up and timelines for building can vary.

You have the manufacturer parts warranty and then the contractor labor warranty and if contractor was smaller they might not be around anymore when a problem arises. 15,000 sq ft roof depending on variables running about 8 bucks a foot but can go to 12 for a flat roof just varies on time of the year, amount of labor hours to remove current roof, and any product shortages.I would check right away to make sure the roof warranty was transferred and is not null and void.   

Handling security deposits can vary from state to state.

its not guaranteed until the title commitment is done and in hand.. lenders want that a few weeks in advance so they have time to review it and check that there is nothing on title they dont like or is a deal breaker to funding.. they dont want to do all the work then have one day to review and approve title. these companies work just like a bank  they have set process's and getting title commitment and funding  same day is not one of them. now myself I will without title insurance.. and rely on a trustee's guarantee and my borrower if something does not go right then my borrower has to make it right.. so it takes a very special borrower that has that capacity.. and or have earned my trust.

Furnishing or not  probably also varies by area. 

.- LendersI want to find a lender that I can rely to provide me a steady stream of debt and who I can show they can rely on me to provide them a good return without dealing with any surprises on my end.

You seem to be relying on second-hand stories to form a narrative that doesn’t hold water.

This approach requires patience and a higher risk tolerance, as the return on investment is realized over a longer period.Ultimately, if you don’t rely on cash flow for income, investing in higher-priced properties with better appreciation potential might be more advantageous in the long run.