Husband retired from Fed.Gov.CSRS what of his retirement am I entitled married for 24.4 years&what am I entitled to by MD state law.Im unemployd 14yrs

My husband and I are currently working out a legal separation. We are not yet legally separated but have been living apart for about 6 months. Then more than likely a divorce. We married Aug 20, 1994. He continued to work making $125,000. to $200,000 a year in addition to his retirement. I would like to know what I am entitled to of his retirement from the federal government and by MD state law. I have been unemployed since may of 2005 raising our son. He is now 19 going into the Air Force. My husband owns 5 or 6 properties hidden under a corporation with a business partner that he claims he doesn't own. I have seen him write checks and collect rents from these properties.