First, let me say how sorry I am that you are dealing with such a difficult situation.
Your husband may threaten to take off, but the reality is is that even if he does you will have the power of the courts to help you, and you will be awarded what you are entitled to, including half the value of the rental properties and half the value of the business. You should absolutely go after all that you are entitled to in order that you may ensure your future and that of your children.
The courts have the power to order bank accounts frozen and even to garnish wages, he cannot run away from his responsibility to you.
You should meet with an attorney in the near future to begin making a plan of action.

I am glad to here you have a plan of action in place. I wish you all the best.