The seller may be unreasonable, as many feel their home is worth more than the market will provide.

Philly is a very block-by-block city so sticking to 0.1 miles for comps is a good rule to stick to, but it's not unreasonable to use 0.15 as well.

Not knowing the full extent of the situation and request, to me it sounds like you're being somewhat unreasonable.

If the subject you are buying is an unreasonable drive time, then you have some " 'splaining to do Lucy."

. #3 - If a particular municipality is too strict or unreasonable, just move your search to where ever you have to.

Are they reasonable or unreasonable?

They are not traditional and if you end up with an individual lender that has not done one before, there is unfortunately an unreasonably high probability they won't get it done in time.Just do a Google search of credit unions and local / regional banks in your city.

Despite the obviously uninformed and questionable experience, beyond forum posting, of the opinions above, this isn't an unreasonable requirement and the courts have largely agreed, and where they haven't it's quite clear from the tone of the rulings, that they soon shall. 

If your house is a 1950s with minimal updates in a C/D area, $800/month is not unreasonable given the 1 bathroom and lack of updates. 

If a request is unreasonable or sets a precedent that you don't want to set, then tell them that and move on.