Planter in the bottom left corner of the photo contains standing water and is not draining properly. Needs to be emptied and unplugged so that water can drain from the planter.
I don’t know if this is the right place to report this, but this seems like it might be a problem. The owner has covered the entire yard and the tree plot with gravel. It looks like they’ve done some additional planting lately, but the gravel is eventually going to stop the water from getting to both their new plants and to the street trees. I don’t think this is OK/legal. It looks like a student rental.