Investing in a building

[Jawad Khan]

Hey guys, 

My first post here. I have been listening to bigger pockets podcast for a while now and really appreciate the knowledge everyone shares, thank you for that. 

I have come upon a investment opportunity, I am a realtor and my brokerage is working on buying some land and putting up a building for their headquarters. The full cost of land + construction is around $8M and they are selling 20% equity share in class a stocks in the company. They are willing to sell shares of .5% at $40k. They are guaranteeing a 8% yearly payout per year on each $40k investment. The building is going up in a pretty nice area with great potential for growth. I have never done this so looking for advice for what I should be careful about and questions I should ask. Any help is appreciated. Thanks in advance!