I'd have to be sleeping with you or, you'd have to have pictures of me sleeping with someone i shouldn't be sleeping with to liquidate notes that will generate recovery against my losses upon foreclosure. 

If you buy a $100,000 property and depreciate it over 30 years, then on paper you are describing a "loss" of $100,000.  

@Bill G  I am sorry for your loss and I pray everyone heeded your advice. 

One tenant = one source of rental revenues (unless you lease the roof for solar..but that's another topic).At a property with multiple tenants/buildings/suites the owner then has the ability to absorb the financial loss of a vacancy while having other spaces bringing in revenue.

If so, that should have been a red flag.If you're in an especially low-rent market (and it sounds like you are) and you're concerned a 12 month lease will make you less competitive, you might consider using an inexpensive loss-leader like a "free 40-inch TV" with a 12 month lease as an incentive to sign.Just remember the price of the TV when you need to go after the tenant for a broken lease.

(budget)When you run a Profit and Loss Report each month and throughout the year, you can tell by your bottom line per property, what property is creating revenue and which ones are causing you grief.You also have to take into consideration the Vacancies, length of Vacancies, and how the market is doing at the time. 

As the demand and price rise more gets mined, as demand and price fall, less gets mined.That is the reason every major central bank holds gold - it is the universal currency of last resort, and is an insurance policy against a loss of faith in their fiat currencies.

Cut my losses. 

Could you explain more about this calculation and how this might differ from other things like loss of lease and physical vacancy?  

@Will Pritchett It does count towards my income however the house hacking method mad it so I was only collecting rent from one unit for the majority of the year and after depreciating etc the property showed a loss.