To remain in the home in Sebastopol, you're right, you'll need to either buy your wife out or give her your interest in some other investment equal to the value of her interest in the Sebasopol house. Your attorney will be the best one to discuss the steps needed.
If, after talking to your attorney, you decide to buy her out by refinancing look for a good, experienced loan officer who can help you. The good news is rates are fantastic now and you have plenty of time to accomplish this, but I would do it sooner rather than later because the market is moving up and higher comparable market sales could raise your house's valuation and increase the amount you need to finance.
Divorce is a difficult time, it is hard to think straight, but finding out what your options are and getting good advise will help a lot in the transition.
Here are three reputable loan brokers I would suggest...
Elise Groves / First Priority Lending / 546-0440
Mark Huisking / Stearns Lending / 524-4840
George Elloitt / Mission Hills Mortgage / 303-2935
Depending on the agreement with your wife, it sounds like you would want to get an independent appraisal to determine the value for splitting the equity in the home. If there is enough equity in the home, you can do a "cash-out refinance" to come up with the funds to pay her. Please note that the appraisal used for the divorce issue most likely cannot be used for the refinance due to lender guidelines.
If you have any questions on the refinance, please feel free to contact me.