Given that it would be near impossible to quantify actual losses, it is best to keep the late fee reasonable.

How do you calculate curb appeal and those things which can't be quantified? 

@Cara LonsdaleThat does help quantify bank requirements.

Appreciation is ok but its difficult to quantify until you are ready to take action.

As an engineer/scientist,  those are words really mean very littleWorking great for him, could very well be horrible for me.So, alas.. enough pet peeving rants.In order to really provide value to this entire forum really is when people actually started to quantify results.So I will start.These are my results in summer:And these are my results in the cold season:So yes the leads do die down and fluctuate over time and depending on the season.But what I have noticed, is that SEO (the one marketing strategy you have not listed), give continuous results reliably. 

A 3 bedroom home in the ghetto might be 1100sq feet, but a 3 bedroom in the suburbs might be 2,000+ sq feet with granite counters and custom cabinets.The same thing applies for their attempt to quantify Neighborhood Amenities. 

Sure, you can achieve quantifiable returns on solid MBA programs, however I would rather build a business and hire MBAs than be one myself.You can also get the equivalent of an MBA by reading real estate investing books, tapping the deep wells of resources here on BP, developing relationships with successful real estate investors, and putting that "free" education into practice.

It's hard to give quantifiable metrics, but basically the more the tenant is aware of their RC rights, the lower their rent, the longer they've lived in the unit, their age and/or disability, the more their city/neighborhood is up in arms about gentrification, the more you will probably need to resort to soft touch tactics.

It quantifies the value the business plan will add to the asset in the current market context.

It's a competitive market.Different investors have different criteria, so it's hard to quantify beyond that.