We show that the group of almost automorphisms of a d-regular tree does not admit lattices. As far as we know, this is the first such example among (compactly generated) simple locally compact groups.
Bader, U., Caprace, P.-E., Gelander, T., & Mozes, S. (2012). Simple groups without lattices. Bulletin of the London mathematical society, 44(1), 55-67. https://doi.org/10.1112/blms/bdr061 (Original work published 2012)