Where is the water coming from? 

We’ve noticed water seeping issues through the shower tiles, causing damage to the sheetrock in our only bathroom on main floor.

On the bathroom window that overlooks her window, put some removal glazing on your window (there is a vinyl that you spray water on the window, apply the vinyl and smooth it out-completely removable). 

There are a lot of condos closer to the water and I wasn’t sure if those were long term or short term rentals.

Also, come resale time, the duplex would have a proven track record of producing income and has definable value, whereas a single family home is largely dependent on current market conditions and home buyer emotions and buyer pool at that given time

Olympic sized pool, hot tubs, on-site restaurant, yoga, pilates, gym, steam, sauna, and management company to take care of it all.

Obviously we have our people scouring the MLS daily for opportunities, we also have a lot of off market properties come our way from the management division, as well as other deals that come to us because sellers know we have a large buyers pool of serious buyers.Find the right investor focused agent and they will put deals in front of you. 

@Bryson WilliamsTypically you would have your tenants pay their own utilities since you wouldn't want to cover someone's high water or electricity/gas bills but some cities will put a lien on your property if certain utilities aren't paid.

I have to say, it seems to be holding water. ;)

...I wouldn't.To make matters worse, the property isn't appreciating (because it's in a low appreciation market, or even a depreciating market), and the tenant pool is primarily made up of people with bad credit, low/no income, and a history of property damage at the previous places they've rented.