if I had to guess, maybe Limelight

Blooms that big I’m thinking Vanilla Strawberry

And I'd guess Grandiflora, aka PeeGee. Produces some of the largest flowerheads of any paniculata (that's what 'grandiflora' means).

adding Phantom. You should have a better idea once it starts to color up.

Phantom is a good guess! It also produces massive flowerheads.

PeeGee seems right to me. They are often trained as trees.

GP would be my guess. But I saw Phantom for sale as a shrub yesterday! But no blooms yet on those plants though, except for one that had 2" blooms not fully opened. If it is GP or Phantom, that tree appears to be too close to the house. Or maybe it is the way the photo was taken? Are you planning to get one now, Suzanne? Hee, hee, hee. ;o)

From the photo, I would guess Phantom also. I saw several in person yesterday and the blooms were enormous...much larger than Limelight. Beautiful!

Yes, I do intend to get one! I used to have a pee gee tree at my old house, and the flowers were not nearly that big, but there were lots more flowers on the tree. I didn’t know if you could cut off some blooms to encourage bigger flowers, or how they got such huge blooms on that skinny tree.

i just looked up the Phantom, and wow! Reminds me of those adds in the old seed catalogues- “one apple makes a whole pie!” That is one breathtaking flower.