How do I subdivide property zoned as timber (TBR) in Clackamas County OR?

My family owns two tax lots, one 19, the other 13 acres. My father would like to subdivide the 13 acre lot, attaching 4 land locked acres to his 19 acre parcel and dividing the remaining 9 acres to my brother and myself. However, the county first doesn't recognize the two lots as two, it sees them as one lot due to some zoning rule. Second, due to said zoning regulation, they won't let us divide and build. My brother and I have been working to figure out a solution that will be ameniable to everyone but so far no luck. Any suggestions?