The pro forma allows the potential buyer to model the consequences of a future but sudden rollover vacancy along with possible commission and tenant improvement costs.

And no, i didn't let him know I was angry at his sudden change in heart.  

If you tell him you found out, he'll think you were digging up dirt on him and wonder why you suddenly started screening him after he's done a good job for a year.

So I am in a rather unique situation where I made quite a bit of money suddenly and thus cannot obtain financing for investment properties, since it's based on the DTI from my W2, which I have already maxed out.One of my business partners would like to do a real estate joint venture with me.

Knowing what the water bill is normally can tell you if there is a leak when the bill suddenly spikes.

Additionally, what does the landlord do when there is a sudden spike in energy costs (like the recent natural gas price spike)?

Sure, the articles a bit early for the season as now we're almost already in summer, but doubt it has picked up in sales, but just more somewhat overpriced inventory piling up as most residents - who rent - likely give up even bothering to try to save up a down payment or qualify for a mortgage.People who are who are looking to uprade their housing situation after the proverbial spring cleaning and tax return season, are likely only moving into a either a more spacious or a more affordable rental in this economy and inflation, if they can find one with the rental market saturated and owners expective prices above comparable market values.Definitely there's a new surge in foreclosures in the area thanks to the Homeowners Bill of Rights being passed last year which prolongs but doesnt relieve/stop the inevitable foreclosure process where a significant % of homeowners give up making ends meet and ultimately lose their home no matter how long it dragged on. 

Real estate mentors' weren't around until a few years ago, when it suddenly became fashionable. 

I know for a fact that during the Financial Crisis, some personal friends of friends had invested in properties that were cash flowing, but that cash flow stopped very suddenly.

This reduced the population of people available to purchase homes and thus caused a decrease (in this case massive decrease) to housing prices.When the market corrected itself and properly priced the home based on actual true economic fundamentals, people who bought back when the price of houses was high were suddenly upside down on their mortgages (they owed more money on their house than the house was worth).