How do I choose a tree to put in the corner of my front yard?

Japanese maple

I would go to a greenhouse that sells trees, have the information or picture of where you want to put it, the mature size you want and mark the pictures where the water lines are and they would be able to help you pick out something that would not harm the water lines.

I love bleeding hearts for a smaller bush - or how about a magnolia?

Maple, ash, elm, birch, acacia, beech, some fruit trees, and some ever greens have shallow roots systems. Shallow rooted trees can be very invasive into water lines and under sidewalks because they ARE shallow rooted. You might want trees whose roots go straight down regardless of sidewalks and water lines. JUst a thought for you as I know you do not want invasive roots. Bur Oak, Black Walnut, and pecan trees, and Japanese maple are non invasive as their roots go deep. Hope this helps Jerry

A lilac bush!

Maples, blue spruce, white pines are notorious for infiltrating water and sewer lines.

Many municipalities have enacted regulations prohibiting the planting of any tree or shrub within 12' or more from the street's water/sewer lines. Know that many trees have roots as long as the tree grows tall.

Best to call your municipal authorities for advice, prior to purchase.

Crepe Myrtle. Japanese maple.