Buying or building Duplex w/ brother and 380k in cash

[Cody TuathaDe]

TLDR: not sure how to maximize about 380k worth of cash in the next 5 years or less


Family is well off, and will be giving each child 250k after our nana passes, and once they have a primary residence and can qualify for it w/out help from the family.

~inheritance money can ONLY be used towards primary residence. 

~I have a 2.5% interest rate on my primary house I do not want to pay off and 200k in equity. 

~Brother will never be able to qualify for a house alone with his current career path. So by doing this they also can qualify for the 250k to put towards their half of duplex. 

~we are going to buy a duplex together and use my equity in a heloc for down payment as well as save another 20k per couple over next year 

~wife and I (plus 1 kid)  will move to one side, His family to the other (2kids)

~going to turn my house to a rental, with the eventual goal to turn my half of the duplex to rental as well (goal is 50 doors by 50 years old I’m 31)

~Market is a bit light, i am considering and open to building duplex. In spokane valley area

~Would love any and all thoughts on creative ways to 1 be the most creative w/ both the heloc and the 250k blessing that we will receive afterwards. Thank you!!!