A KEY thing to know with a tankless heater is that it needs to be vented horizontally to the outside and 3 feet from any window or door.

It could just as easily be a city main issue, or, the entity that is responsible for the horizontal line from one unit to the next...HOA, or ?

Get some bids on horizontal work, bringing in homes then weigh it against the income and then compare it to being a campground.It may be better to go the RV space route before a new MHP in less there is a ton of housing demand.

Looking at a map, if you were to draw a horizontal line directly across the city, you can generally expect that the properties on the North side will not be in flood zones, and the properties on the South side will be.

We went back to the bank to secure approx $1,200,000 for the horizontal piece, which includes culvert for creek crossing, clearing for roads, and roads themselves. 

The process of developing land can be separated into 3 sections: entitlement, horizontal development, and vertical development.

However there are very large horizontal foundation cracking on all 4 of the basement block walls.

Look at it at 12" horizontal intervals.

The reason for this is most associated with poor grade or pitch which caused  excessive soil /water pressure against the wall resulting in incremental displacement as wall yields to horizontal earth pressure.

Also, the horizontal cast iron waste line to those sinks will corrode and acquire a buildup of scale on the inside, which will "catch" paper products and debris leading to more frequent clogs.