It is difficult to quantify all of this, so it is very much an art as it is a mathematical equation.We know there is a history of crime in the area.

The parties acknowledge and agree that significant damages will be caused by a breach of any of the clauses of this Agreement, but that those damages will be difficult to quantify.

there are ways to quantify this.... 

Point being, its simply not quantifiable.

It's hard for people to quantify their time value but it's incredibly important.

Can you quantify GREAT appreciation ?   

A different matter.Judgments can cause your tenant's bank account to get hit, they could lose their rent money causing a late payment or default in the lease.I'm not sure how an accurate point system can be devised that would stand up in the event a tenant complained of a rental assessment (a judgment is enough for a denial) but scoring other matters between other applicants......I wouldn't go there.Once you take aspects of your underwriting from a subjective side (having the ability to use your opinion on the matter) to an objective side, quantifying some matter, then you open the door to your system being fair and accurate and it won't be.I say it won't be because multi million dollar programs can't meet that standard, MUELS, a mortgage underwriting system has kicks that can't evaluate objective matters, so I'm sure a landlord won't be successful when institutions with big bucks can't solve such problems.That said, having some system certainly helps you determine applications on a consistent basis, it's a guide for you to remain fair in your assessment, in your mind so to speak.

@Jason Cobb It's cool how you are looking at the problem and trying to quantify it in different ways.

Hard to quantify what the value add is..... perhaps 10k to 20k.Some ideas i have are:Grab the lot and:Sit on it.  

Quantify and market how little energy your rental home actually REQUIRES without the PV array. 2) Flippers and long-term owner/occupiers should add solar potential to their list of attributes when they are analyzing a deal.