Passive real estate investors

[Storm S.]

So I'm working on making a Robo-Advisor for real estate investing. My idea on a high level would be similar to betterment or wealthfront, but instead of investing in general stock portfolios. The model portfolios would instead be highly concentrated in real estate, mainly consisting of public's REIT's and real estate etfs. I'm considering going one of two routes. Having the investors put in there investment criteria and goals and then having them assigned one of the model portfolios. Should I make the portfolios all diversified between the different sub sectors such as office, retail, industrial, hotels etc. and have the differences between the portfolios be how aggressive they are or should I give the investors the freedom to choose how much they want to allocate to each sub sector. Any opinions would be greatly appreciated.