Observations by jharder

Ok. Need help. Had to take this tree down in my front yard - was slowly dying over the last couple years. Westchester neighborhood in Miami. House built in 1962, back when this area was probably "wilderness." I've owned it for 5 years.

1. What is the species? I've never seen fruit/seeds on the tree. None others like it in the neighborhood. Wood is very heavy and hard, although easy to cut.
   2) How old is it?? I've included a couple higher resolution photos after sanding one of the logs. Depending on what I count as a ring, I can wind up well over 100 years old, which wouldn't seem to make sense if the tree is exotic - who would have planted it out here in the Everglades at the turn of the century.