So now you have 4bedx2 house and one master. 

This is great business.This thread is good though, because all Title master is willing to give answer for the question with lot of details !

@Jack B. if that is what you are looking for, look into Business Development Companies (BDC's) and Master Limited Partnerships (MLP's). 

I actually just did a renovation on one of our properties and split the master closet into 2 separate closets. 

Do you have a master key that will override any programmed code? 

You will make several mistakes starting out and will only be worth it if you then continue to refine and master that specific strategy.

Third, the addition is will be constructed to the existing master bedroom that is currently occupied by tenants.

The owner wants to minimize the capital gains tax he pays so we want to suggest to him to do a master lease to us for "x" amount of time, and we pay his lease fee and hold the rest of the money in this time we will secure a loan to buy using the money we make as part of the down payment.

So I'm a 22 year old investor just starting out I started flipping my first house this year and I plan on being finished with it in a month or two and I've been looking at how to invest my profits for the most return on investment, I'm leaning towards seller financing vacant properties and master lease options but I want to get another opinion, so if anyone has any suggestions I'd be glad to hear it.ps.

With a stylish updated kitchen, comfortable living area, tranquil master suite, 2nd living room with a bar, and a bonus room on the 3rd floor, it's perfect for unwinding or entertaining.