Gross world product is on the order of 80E12 $ per year (PPP). Where can I find an estimate of the net value of the world's assets (companies, properties, infrastructure...)? Preferably with some more granular statistics.
One place that estimates the world's wealth (measured as net value of assets) is the Credit Suisse Global Wealth Report.
According to the report their estimation of worlds net assets is 361 trillion of USD in 2019. Their site has also statistics for other years. They also offer some country level statistics in their reports (not sure if that's granular enough).