One of the tenants in a duplex with a shared water meter is complaining that he should pay lesser than the other tenant because he doesn’t use the water that much.

As well, I told the seller it will take a few months to do our due diligence (inspect water, sewer, zoning, what needs to be done to build, how much it will cost to tear down the garage that is still standing).

It won't matter to them how long you need the water.

The place went on market in July 2019, however he didn't have the water individually metered.This created a water bill between 1500-2000 a month, and killed the NOI.The seller just had the occupied lots individually metered.

Currently 21 are occupied.Lot rents are currently $190 and Park owned homes are between $350-400 currently.The place went on market in July 2019, however he didn't have the water individually metered.This created a water bill between 1500-2000 a month, and killed the NOI.The seller just had the occupied lots individually metered.

Corporate and Real Estate Attorneys can be expensive but they are there to strategize on your behalf to help you navigate legal waters which could in the long run cost you your home, your business, and basically your financial life.

Also we avoid opening walls unless we know we have to (water damage or apparent structural issues) with the reason being once it is opened we need to bring it up to current code. 

I could/might do 50/50 where i do 13.5k of HELOC and 13.5k of my own cash.Sorry for the long post, but does my logic of HELOC pay off hold water in this situation?

I will be closing on my first four plex rental and I am running into the issue that the water and sewer bill is sky rocket high. looks like the tenants use up a lot of water.

Cash or construction loans only and the seller will not turn on the water.