Is the contract binding?

most likely yes. if you moved into the space and the landlord accepted you, then binding. If you are trying to void the contract based on failure...

How to remove a name from an LLC, before sending a statement of information?

if you have an operating agreement it should contain provisions for removing a member. Follow those provisions and then file Statement io...

What to do when a business co-founder is destroying products intentionally and he's the only one who knows how it was built?

you didn't indicate the nature of your relationship which could make a difference in how you proceed. Regardless document his actions seek attorney...

Unless the by-laws prevent it, the state allows

What is the optimal/recommended business structure? Which state should this structure be in?How quickly can setup be completed?

You need expert advice. If you engage in fund raising you will encounter state ads federal securities laws. If money comes from outside the U.S....