We charge a water or electricity fee.

I think there may be a market for a lower density campground that offers a higher level of privacy per site with amenities (electric/water hookups, RV dump site, bathhouses, etc...) but...

Basic plumbing, electrical, HVAC knowledge will go a long way.

Hot water heater, furnace, gas, electrical box, HVAC, oil tank, plumbing pipes.

People think it's inexpensive to install a Washer & Dryer, but getting the gas, electrical, water, and drain/vent there is usually quite expensive.Here in Chicago, we always want to be at the top of the market regardless of the competition, so we almost always install a W/D when we renovate our properties, even in some of the less desirable neighborhoods.

I’ve had to evict the original tenants, got rid of a roach infestation, and the electrical seems iffy.

Here are the numbers I know so far:Rents4 units all currently occupied on one year leases- #1: 1/1 $995 monthly- #2: 1/1 $995 monthly- #3: 1/1 $995 monthly- #4: 2/1 $1,100 monthly- Gross rents: $4,085 monthlyExpenses- $12,070 taxes annually- $350 monthly insurance (my estimate, they have liability only right now)- $175 monthly landscaping- $120 water (electrical on separate meters, tenant pays)- Total expenses: $1,651 monthlyNOI around $2,434 before vacancy, maintenance, and management (although i would likely self-manage these)Property needs about $50K in other repairs and udpates from what I can see.

Storm ponds, storm drains, flood ways or flood zones, underground electric, fiberoptics, etc.On the concept plan above. 

It was quite extensive, all new electrical, hvac, plumbing as well as foundation, painting, floors and yardwork and demo of shed.

Common concerns in pre-1940s buildings include outdated plumbing, old electrical systems, and structural issues that could be costly to bring up to modern standards.