I would also put in that if these jobs are the tenant's responsibility, and they don't clear snow from the sidewalk or keep the grass below 6 inches in height, you will take over that responsibility and start billing them monthly. 

It is a 3 inch clean out that connects to a 6 inch pipe.  

The second lots storage buildings are from 2 inches to 12 inches on the first lot and the 2 sheds are 12 to 20 inches on the first lot.Both lots were sold to another person who did not have the skills to manage the apartments. 

If the cracks are superficial i would just put up some 1 inch strapping on the walls and sheetrock over it but if they are bigger cracks i would that could potentially create more problems i would fix them for sure.

My ultimate plan is to sell my lot to a developer who will likely construct a multi-unit- the lot is approximately 10k square feet and zoned for multi-units.The benefit is that they are paying the cost to build a new wall between the two properties, as there is no wall there currently.However, my concerns are (1) will this affect the future value of my lot- as the v-ditch encroaches onto my property approximately 12 inches, effectively reducing the useable square-footage of the property?

You want about 3-4 inches of coverage up the wall, and same on the floor. 1 oz I believe makes a gallon of mixture.

Again, this is an area you can do yourself but it may be where they are willing to pickup some of the legwork as you inch closer to a purchase. 

The casing is barely half an inch off the countertops, so it would look bad it it wasn't level with it.

It's as deep as 8 inches in some spots and maybe only about an inch deep on the right side of the property. 

As I noted above, I have been monitoring the higher limits for a while, have a dozen or two props earmarked on Zillow, and not a single one has moved an inch.