In other words, you cannot rightfully exercise a contingency and cancel a contract for a visually obvious/open reason, such as thinking that the property now appears too dated. 

Checking it out visually and in person is  an intangible human test that you can't quantify, but IMO is incredibly important.       

It will be so much better right up to code.Nice 200 amp 220 volt service with breakers GFI's and dedicated plugs as needed.Plus you will probably have a lot more plugs, and all 3 prong grounded.Electrical knowledge has come a long way in the last 100 years.If a lot of the other rentals in the area are the old wiring type, you can point that out to your renters, show them the new breaker box and explain the GFCI outlets and dedicated outlets to them.If you need a new electrical drop consider putting the weatherhead in a place that makes the place look more visually attractive (but look at cost of this too)?

You can visualize how the principle vs interest amount you pay per month changes by using an amortization calculator, my personal favorite is this one: https://www.bankrate.com/calculators/mortgages/amortization-calculator.aspx Just like Ronald mentioned above David Greene goes through all the different strategies of paying off your mortgage in his book.

Home buyers are very easily visually influenced.

It's a great read and can help explain these concepts a little easier if you're a visual learner like I am.

It took me a while to visually understand that.THAT'S ALL FOR NOW FOLKSThanksSabrina 

Help renters envision the space by appealing to their visual side.

I work for a visual-first communication software with a specialization in the trades that include agents, property managers, contractors etc.

It's a visual representation of care and attention to detail.