You would have to put a small kitchen ( sink and undercounter refrigerator, microwave and counter top)  and a bathroom in it.   

To put it in perspective, you are not going to put granite countertops in a $600 a month rental unit (maybe you will maybe you won't) because the cost doesn't justify the ROI. 

I want to put granite counter top on 1st renovation.

We pay him 12% markup and I pick out and buy most of the items you can see -- tile, cabinets, vanities, sinks, countertops, appliances, lightening, etc.  

If not, a free-standing, wall-mounted, or countertop wine rack will do the trick.

where did you get your cabinets and counter top.

Then it takes another 3 weeks for stone countertops as they will not measure until the cabinets are set.  

, the countertops would be replaced (not as important but definitely needed), painted, cleaned, tub would be tackled and re-caulked, the garage door would be fixed, and that would all get done before the move in date.

Both units recently renovated with new carpet, paint, countertops, tile.

If someone is collecting $1,000 a month on a consistent basis without enormous expenses then I am buying the house next door and throwing a granite countertop in and taking that tenant away.