Hello Fly and thanks for your question.
Carl is absolutely correct that you may execute and have recorded a quit claim deed and remove your name from title if all parties agree. As you and the co-owner are on title and loan for both properties, the lender will be involved in releasing you from the title and loan obligations, and this is usually something the lender is reluctant to do, especially if the co-owner is unable to qualify for the payments without your income.
Since your homes are located in Sunnyvale, surely, you have some equity left in the homes, and walking away from the properties may be an unwise situation without proper legal and financial counsel. Also, if you are both having problems resolving your differences, perhaps it would be better to have him "buy you out" or, at the very least, agree to separate the two properties between the owners. In other words, have both properties appraised and then determine how each will buy out the other to obtain--in the end--one property per owner. Again, talk with an attorney to explore your options before dumping your valuable assets.
Grace Morioka, SRES, e-Pro
Area Pro Realty