What about the crack in the patio you are standing on?

Contain the area by sealing it off with plastic sheeting, like a cowboy wrangling a steer!

The warranty excludes standing water and plumbing leaks - this is probably the reason.So while I am impressed with how waterproof it is, this is a kitchen with dishwasher ina  rental property, so we will go with LVP which I know is 100% waterproof as it's core is just plastic. 

Plumber goes out and says its stuffed with wipes, tampons, plastic bottles, condoms, toys.... you get the idea.

Should be an easy fix to add a side gate, sliding glass door, french door, or regular exterior door and steps/patio. 

I've never dealt with Septic in a park, but plenty of experience on SFHs.My advise would be 1) Find out the age of the tanks 2) Find out the material they are made of (concrete or plastic) 3) Same for leach fields.Reasons being: Old concrete tanks are far more vulnerable and likely to fail soon....the newer plastic tanks will most likely cause you no problems for a long time.So if I personally were to find out that these tanks were all plastic, and <10 yrs old, I would barely even worry about this.

There was also a thick plastic covering the ground.

I'm also curious how much it costs to prepare the land and install plumbing, electricity, and concrete (driveway, walkways, patios).I'd love all the insights I can get from anyone that has experience doing this.

We put on tyvek suits and opened the windows that worked , broke the glass on those that didnt , threw fans in the windows for 4 days before we went back in .( neighbors complained about the smell and the closest house was 50 ft away )  We made a pump system and used a new plastic trash can and sprayed with a garden hose over 100 gallons of a bleach , soap and water over floors , ceilings and walls just to sanitize as best we could . 

It's not just about the greenery; features like patios, outdoor lighting, and water features can significantly increase a property's appeal and, consequently, its rental value.In Orlando and its neighboring cities, several rental complexes have reaped the benefits of investing in their landscapes.