KK wrote:
Yes - that's it - thanks - can I propagate a new one?

Marvelous! There's always been a rhus in my life )

Rhus usually sends suckers, if not you will be more successful by doing
it via root cuttings. The 'cones' you mention are flower heads. Many of
the roots are quite shallow (I'm forever finding one in my bed, garden
bed that is ...). If your neighbour's tree is in a lawn, he/she might
get a bit upset you starting digging roots ... I would suggest you get
yourself a sucker from it, if there's one and do this in the spring.
Carelully dig it out by keeping the main tap root and cut it from the
main plant. Alternatively, offer yourself your own plant they are not
that expensive, slow growing and quite ideal in lil' gardens.