Depending on conditions of coarse.

It is also area specific, depending on crime, vandalism and risk factorsI personally use Zurich Builders Risk Policy on my flips.

@Chris Mason Respectfully, not everything is math...there are all sorts of reasons that someone may be in a position to pay a higher rate, these "challenges" (DTI, Credit Score, BK, F, etc) can be overcome by going to person lender who can overlook these and a deal can be "handcrafted", secured against the collateral vs. fitting into some bank's guidelines. 

It depends.

They recommend passing their 100 question exam with an 80-90% score 3 times before you schedule your exam.

But of course that depends on the specific location. 

You have banks ( local,regional,national), credit unions, life insurance companies, & CMBS lenders.Who does what loan depends on location, asset type, and size of the loan.

The amount varies depending on the borrower but also the size of the lender and their reserves for loans. 

@Leonard Smith It depends on what marketing you will be doing.

I have always used 15-30 year fixed rates, but I have been reading about ARM's as a possibly better option depending on how long you intend to have the financing or the property.