Anyone looking at your books might want to know why you suddenly decreased that units rent by $200 per month. 

Continue to devour as much information as you can about the business and suddenly you'll become an overnight success without even realizing it.

When credit dried up and property values decreased, those people were suddenly underwater and on their way to insolvency. 

Having said that, I would place more of the blame on the real estate market self-reinforcing the current environment where property values increased and banks were willing to lend on higher values which led people suddenly being able to access more money which in turn led to more money being spent on buying real estate.

After it all crashed and the market flooded with foreclosures the surge of DIY flipping hit the TV in conjunction with a viewer apatite for "reality TV". 

Suddenly she decided the daughter living with the dad might want to move back in with her so she declines. 

It looks like someone started making repairs and reno but then suddenly stopped and now its on the market.

I understand their property values decrease, but do their tenants all of the sudden stop paying rent? 

Why the sudden desire to flip instead of buy and hold? 

So, I have an apartment and 2 months ago there were suddenly biting gnats appearing.