Thank you both for your posts. It looks more closely to the Styrax (Japanese Snowbell). Many folk here were guessing a Cherry Blossom tree, but that didnt look quite right with a closer look at the flowering. The smell from this tree was magnificent as I took the photo.

Looks to me like Schinus molle ("pepper tree") which has tiny white flowers followed by clusters of pinkish berries which as they dry have a nice peppery smell.

That's what I think: looks like a Tatarian maple. Some stock in cultivation is hybrid, with intermediate characteristics, so any confusing specimens encountered may be one such. Multiple introductions of "Amur" maples made in recent years by wholesale nurseries have suspect characteristics, like narrow, erect growth habits and mostly unlobed, dull green leaves traditionally attributed to Tatarian maple.

I'm no expert but it looks like the tree is suffocating. It must have been planted too deeply to begin with then the mulch dressing is really finishing it off. If it were me I would remove the mulch and rake away some of the top soil almost to the point were the feeder roots are visible and as far out as the drip line. Then I would put a light top coating of wood chips (not shredded which could compact) over the top. This might seem drastic but you have nothing to lose since it looks like if you don't do something you'll probably lose the tree anyway. The tree looks like some kind of Poplar. Very pretty. I love the conical shape. Perfect for the space. It would be a shame to have to get rid of a tree like that.