If "we" owns the LLC, then that would indicate the LLC files a 1065 partnership return. The passive losses from one would therefore offset the gains from the other without any special action on your part. This would be reflected on the K-1 each partner gets issued, and reports on their personal tax return. The results of the K-1 entry would be on page 2 of the SCH E of the personal 1040 tax return.
Otherwise, if it's a single member LLC (that has not elected to be treated as a C-Corp or S-Corp) then nothing concerning the rental property is reported on SCH C. It still gets reported on SCH E. In the end, the passive losses from one property on the SCH E, will offset the gains of another property on that SCH E. You don't have to do anything special for that to happen.