My parents have a few tall trees, and they get them inspected by tree surgeons at least twice a year due to the proximity of neighbouring buildings, and because it's the right thing to do. Fairly early last year, someone from one of the neighbouring houses knocked to let them know he had gained a horizontal tree overnight.
It was half a 60+ft poplar, that has been inspected less than a month before. Amazingly, it landed neatly alongside the rear wall of this person's house - all he could see out the back door and windows was foliage. The only damage caused was to two fence panels and the adjoining post, and some trim had been knocked off a shed. Amazing really! As with yours - looked absolutely fine to the trained eye.