My point: The GR showed us the downside of leverage.

The biggest mistake was being afraid of vacancy.

They did clean up the garbage and remove the deer but the people coming and going along with the noise is the biggest issue. 

The downside of not replacing it is air conditioning systems fail when it's hot out, when they are needed the most and when it's most unpleasant for the renter to go without air conditioning. 

The biggest is going to be whether the HVAC is properly sized for the building.

That said, syndications come with their own downsides.

I'd say my biggest mistake was not researching the property manager properly before hiring them.

you left out the biggest factor which is risk.

The kitchen and bathrooms were the biggest areas of concerns as well as the condition of the roof.

The biggest thing to consider is: if you sell your house, will you also live in the next one?