Fortunately in today's competitive market buyers may not demand that.

I have worked with my lender before and appreciate how competitive they both are. 

My dad was a small town attorney and took this kind of work from people in the cities all the time since he charged the small town rates.No worries, we can all take competition, but as a client, its hard to find a small town attorney if they aren't active in visible places.

You can personally visit these sites and see how your competition is doing and then there are paid sites like AIRDNA who provide some level of statistics to help you out....

Your sphere and neighborhood are your competitive advantage to find deals.

While you could, however the risk is your rent would not appear competitive unless that is how you whole market is doing it. 

There are exceptions ofcourse, multifamily can be 20-25% as it is much more competitive.

We've won numerous offers for homes on the Eastside, Seattle, Northern Tacoma, etc. and the market is very unique and competitive in each of those areas. 

@William Walker multi family is very competitive, for the right borrower even 15% is possible although unusual. 20-25% should be expected.

I have a 3 bdrm 3.5 bth 3 level town home that suffered a heavy loss fire in May.