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This paper considers the problem of adjacent channel interference between two different operators using different duplexing methods. Focusing on the interference between two colocated base stations, which existing guard-band based methods still cannot solve efficiently, we propose a scheme that adjusts the downlink power of the aggressor system to maximize the downlink transmission capacity while keeping the interference introduced to the victim system in a tolerable range. In addition to the power allocation scheme, a downlink user allocation scheme is proposed to improve further the downlink capacity. Simulations on 2.6-GHz systems show that the proposed schemes enable coexistence of two co-located base stations, and that the frequency spectrum is utilized more efficiently.