However, it's counteracted by your gross rents and some expenses as you stated which is different in two scenarios:You bought the property less than a year ago and the expenses are not yet on your taxes - Then 75% of your gross rents (or market rents if not rented) are used.

Obviously, when mold is present and spreading your structure is experiencing decay at times more aggressively than others. 

Columbus multi-fam housing stock is highly fractured between expensive wealthy suburbs/trendy gentrification areas and urban decay, with very little in between.

There is no such thing as investing in a declining city that is decaying at the speed of sound (gun fire). 

Depreciation is the process of modeling decay of structures over time - depreciate that $200k over 30 years and that's $550 per month.  

Hydro power generates more energy than is input into the power plant because the sun moves the water from the oceans uphill by way of rain.Petroleum produces more energy than is consumed in extracting, refining an transporting it because biological organisms captured the suns energy in the form of converting simple molecules into more complex ones.There are fundamentally only two sources of energy available to us with out current knowledge of physics - solar and radioactive decay.

Heck, it's the most positive thing in the world...you take a rotting, decaying neighborhood that was once beautiful, and you spend your money and you take the risk to make it whole again.

I see the US-Canada currency exchange as a way to counteract that.

I'm sure the super cheap CA taxes will counteract the negative cash flow.

While so many people are looking for returns in order to not only build wealth, but also to counteract the effects of inflation, anyone holding rental properties can simply increase rents to protect themselves.