It would make more sense to build with concrete or block and have tile or metal roofs than standard stick built with asphalt shingles .

We can produce asphalt shingles here if allowed.

I came back to Ohio and started working for a construction company, and have been there since. (2017) Currently I manage an asphalt plant for them in Columbus.I haven't done a ton of real estate investing, but have a strong understanding of construction, and project management. 

As there is only a one lane asphalt driveway that goes between the building and the east property line the contractor will have to operate his heavy equipment there and will hurt tenant access and definitely damage the asphalt.

bump this up to 4 units no reason to only build 2. you could go vertical on top of this 2 more. switch to asphalt. save every penny you can where you can. we build triplexes in columbus ohio ground up and similar structure. mostly urban core where the numbers are the best 

After some research, I've come up with the following:- Blown-in insulation to fill the joists with hard-packed cellulose- Add asphalt panel board layer across the entire ceiling to the existing drywall and fill the cutouts. - Add a second layer of 5/8's drywall to the asphalt board. 

In that stretch of ocher and asphalt there are multimillion-dollar mansions and also some of the city’s most affordable rental apartments.

We would consider caliche for the driveways or possibly something nicer (chipseal 2$ft/asphalt 3.5-4$ft/concrete 10$ft). 

.), the location, depth, and capacity of utilities to service the site - including public utilities (sanitary, storm and water services), franchised utilities (power, gas, cable), capacity of the local streets to accommodate additional traffic from your development...Be sure to find out if there are any specific local ordinances you need to satisfy (possible tree & wetland surveys, together with any necessary tree & landscape or wetland mitigation plans) and whether there are any concerns from municipal departments (e.g. hydrant locations from the fire department, storm inlet and retention requirements, as well as asphalt / concrete road requirements from the engineer), entrance requirements from the road commission (left turn and passing lanes at the site entrance), etc.Once you get past all this you can finally prepare a preliminary site plan and enter the political arena to get preliminary site plan approval, and to address any concessions the board and neighbors want from you to overcome their objections to your development.

The new owner bought the house after I purchased my land, and he might not be aware of these encroachments.Is there any risk for me, such as the possibility of acquisitive prescription of a part of my real estate after years, especially if (theoretically) the neighbor incurs considerable expenses for e.g. asphalting his driveway?