property values are wealth. mortgage payments are costs. one doesn't imply anything about the other.
Are the properties underwater on the mortgage?
Can you rent out the vacant units?
Are the properties underwater on the mortgage?
Can you rent out the vacant units?
It seems like getting those two sorted would greatly improve your monthly situation.
going back to the wealth thing, I recommend you think of these places as assets, not set in stone. If you are ahead on your mortgage, they literally are, slow to sell but worth real cash.