would not worry too much.

1) length of 1 house, no issue
2) length of the entire taman ... as in back lane, little worry
3) length of 2 condo, real issue.

effect is just misunderstanding and argument. so just try to back off if there is an argument within the tenant of the house.

if its possible ... provided have space ... get one of these potted pine tree to block the view of the lane.
just tall enough to block the view. your local nursery should have them.

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anything alive can help with dispersion of chi ... pine tree don't require much maintenance. 

take a photo form your door looking toward the lane would be much helpful ... again i cannot remote view people house.

if the sketch is accurate, the it hit in between you and your neighbor ... no issue.
don't get too worry with non existing problem ... a taman back lane is too quite to cause "sha chi"