Imagine if a tenant had lifetime rights to a property he/she was renting. A landlord would never be able to move into the house that they bought, kept up, paid taxes, marketing fees, rental commissions, dealt with collecting rent, maintaining the place for the renter, etc.
The landlord/owner of a property can evict current tenants by performing an "owner move-in" eviction, but it is not a move that should be made without considering the legal ramifications. Oakland happens to have a very strong set of tenant protection laws in place that impose harsh penalties on landlords who don't follow proper procedure.
Here's a great article on owner move-in evictions, written by one of my favorite Oakland landlord attorneys, Clifford Fried, Esq.: http://www.friedwilliams.com/pages/articles/id5003.html
You cannot force anything. However, you have the right to live in the house or unit you own. You cannot do it during the first year lease period if your tenant is still in that period. If you tenant is month to month you need to give at least 60 days notice. I would be kind to your tenant and work it out. Meaning, that if your tenant needs 70 days, make it work. Talk to your tenant. Most understand that situation and will cooperate. If not, you may have to talk to a lawyer to evict..