Between my house and my neighbor's house is maybe 8 feet on a good day, four of which are on my property. Right now there is a sidewalk of sorts which was poured from my foundation (not attached to) to the small 'curb' of sorts on which sets our small (4') dividing fence. I would really like to rip out all of the sidewalk and put grass and maybe a row of trees to improve the view a little out my side windows. I would really like to plant some quaking aspens, but my husband is worried about the effect it might have on the foundations of the two houses. The sewer lines wouldn't appear to be an issue, they are on the opposite sides of the houses. Does anyone know what aspen roots do? Are they harmful to foundations? If so, does anyone have any suggestions for a deciduous tree that would plant well in a small space?