Consider selling the duplex to put it into a higher income producing asset (out of state, DST, something).

But what you stated seems like it could be a good idea.

Like most have already stated, there will always be some type of curve ball in a flip, small or big. 

Anyways I sent him a notice through a lawyer about this issue stating that he is breaking the lease.

Welcome to BP.One of the things to consider is we have 3 different states in the area with wildly different laws on this topic.

Quote from @Kar Sun: My tenant's lease is coming to a close and I am relieved she will be moving soon.She has been paying on time but has been extremely unpleasant and rude.While the money does not smell my mental sanity is more important than money in this case.She sent me a registered letter stating that she feels "unsafe because we have not done the fixes the way she wanted it".She requests to have her witness for a walkthrough.In my state a walkthrough is required but I am not about to grant it to her to bring any witnesses as that is not in my contract.If she feels unsafe she does not have t be present.I also do not treat a final walkthrough with a tenant as a final sign off.This walkthrough does not include a detailed inspection of the plumbing and the appliances that will be done after she departs.This is simply for the visible cosmetic issues and should take less than 1 hr.  

Net Income: 100k~ depending on overtime workedHere is a breakdown of the potential property we would be looking at buying as a long term investment. 3 Bedroom, 1 Bath, 1000sqft, attach single car garage, fully fenced property, needs no work and would be in a state of immediate ready to rent.Purchase Price: $289,90020% Down payment: $57,980Mortgage Rate: 4.5% Amortization: 25 YearsProperty Tax: $3185 annuallyBi-weekly Mortgage Payment: $592Rental Details:Monthly Rent: $2600Mortgage: -$1184/monthProperty Manager: -$260/monthLandlord Insurance: -$105/monthProperty Tax: -$265/month15% Put Away: -$390Leftover: $396Does something like this make sense to jump on?

Some impressive features including extensive listing/syndication and state specific guidance provided such as max security deposit.RentRedi is a flat fee for the most part and has some cool features like pre-qualification and integration with QuickBooks.

Close proximity to NYC, the nearby state park, and a destination by itself for certain people.

What a person is stating when saying this is: Hammer or Saw, which is better for building a home?