Of those options, the out of date fax function is by far the most convenient. 

This application automates "back of the envelope" calculations, making it easier and faster for users to find and assess profitable real estate opportunities based on their specific investment criteria.

But if they're selling stock or cashing in stock options, they now have 20% to 50% less purchasing power than they did six months ago. 

So when you provide that option to them, they're more likely to treat it well.

Based on Noi/Piti derived from the 30 year amortization?

We made the mistake of thinking the person who charged less was the better option, however in the long run we spent more.

I've considered different options, such as refinancing this home to make the land a separate transaction or even selling my house to build a duplex, (since I am not sure if I will be able to get financing for the construction project if the land and this current home are on the same loan).

Try to narrow down your options to the top 3-4.

Inspectors may note it during that part of the process but I've never had a buyer ask me to have one done, or ask if they could have one done; people are either comfortable with it based on the inspection report or they're not and they pull the plug from there.

A comp based appraisal is going to be based on comparable sales, so yes.