Its not uncommon for people to ask for high numbers so I mentioned my comps which showed LLC's purchasing the exact same lots for 75k-150k so i countered with 75k.

In the area being considered, its not uncommon for there to be no offstreet parking for retail.Not sure about the exact tenant, but the area is getting alot of development and there is a small strip mall across the street.  

It is not uncommon by the way for investors to walk away. 5 years ago is the 2007 vintage when most markets were at the peak.The investor has a high interest investor loan and a high sales price.Probably was just breaking even hoping for the market to turn.Now that the tenant left a bunch of damage the investor is jumping ship and not pouring anymore money into a bad investment.At the owners age enjoying the last years of their quality of life is more important than an overvalued debt to a bank.

Its not uncommon to find these houses on double lots from many years back.

Duplexes and Triplexes are managed much more like single families than multi family / commercial properties so it is not uncommon for an owner to not keep his own records.  

Appraisers are now on the other side of the pendulum, generally being very conservative with their valuations.It is not uncommon when a house is sold today for the appraisal to "magically" come in right around what the home is selling for.

It is not uncommon for Section 8 to also provide program participants with a subsidy for utilities.

Your issue is not uncommon - consider delegating some/most of the tasks to virtual assistants and/or other people on your team (rehabbers, project managers, realtors...etc).Do the things that you are good at/cannot be delegated like negotiations/talkers to sellers...etc

The agent may be used to selling move-in ready single family homes to owner-occupants where an offer $40k under ask would be pretty uncommon.

For instance, in my area, it's not uncommon for the Leasing Fee to be 6% of the annual gross rent with 10% management every month thereafter.