Contrary to what people believe, timber actually has very good fire resistance characteristics: https://csengineermag.com/fire-design-of-mass-timber-members...

No need for densified wood to build midrises, structured timber products like CLT (basically, fancier plywood) are already being used to construct 5 - 10 story buildings with the tallest wooden skyscrapers being planned at 20 - 70 stories tall: https://edition.cnn.com/style/article/wooden-skyscraper-revo...