run into

I run into my neighbor.

私は隣人とばったり会います

I often run into my neighbor.

私は隣人とよくばったり会います

I often run into the neighbor from my floor.

私は同じ階の隣人とよくばったり会います

I often run into the neighbor from my floor on my way to work.

私は出勤途中に同じ階の隣人とよくばったり会います

I often run into the neighbor from my floor at the apartment entrance on my way to work.

私はマンションの入り口で、出勤途中に同じ階の隣人とよくばったり会います