Anything sinking suggests unstable soil below the footer, or an improper (or non-existent) footer.

I think he will likely only get ~$500K for the property.I think most investors would be better off buying an RE with existing ADU than constructing their own ADU, except for the knowledge gain. 

I wasn’t aware this existed

Too many times, I see investors and managers fail at these things, and then feel forced to say that the market is saturated.  

I have only seen it make sense when the location of the existing park was so incredible that the intense amount of time, money, and effort was still worth it.  

I didn't want to come up with $132k so I purchased the property subject-to the existing loan of $122k.

-Current tenets do not have the best credit-tenets do not have 20% down payment-If I increased rent to the max $1250 i see them moving I would like to sell to the existing renters to reduce the sales fees and the head ache of having to list and move them out to paint, replace carpet, etc, plus they are really good peopleIm seeing my options as:1: Normal sale...and move them out(realtor said not to many investors in the area are paying $225k for a $1100 a month profit)2: offer to them and hope they can figure out traditional financing 3:?????

Make sure that your existing property will still safely cash flow after the new mortgage or loan payments kick in. 

Even if it had become a bill, my understanding is that it will stop existing multi families and will not stop the new 2-family condos that are being built (like the ones in JC Heights)

If a column, you could install a decorative but usable small handrail down the existing seam and still use the wood you have already.