In my house I have a Maax which has the tub and lower part of the surround as one piece and then a second piece of the surround is added higher up-so it eliminates that join where the edge of the tub meets the surround where water tends to pool. 

Also, if the groups that you are investing with offer any type of tiered structure, are you typically pooling enough capital to fall into a higher tier?  

Having done the barest of research, we've looked into the idea of pooling our money to try and buy a multifamily for my wife and I, my dad, and the two friends, as the two friends also want to stop renting and to start owning, even if it is part of a multifamily/apartment building.

How much water is there?

You will likely need to upgrade the water service to the building as well.

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One of our tenants had a higher water bill due to the leak that has happened because of water heater failure.

If you don't own the house yet, you really need to pay the guy otherwise it's a waste of his time.Sometimes roofers and pools companies will give an estimate based on google maps. 

I bought a triplex where the Seller (not a foreclosure) was lazy and didn't want to put in hot water heaters even thought he got full price offers.

I called the agent and it sounds as if the issue was really with the front porch allowing water under it and causing water to leak into the basement.