Microsoft recently released building footprints for all of Australia. See their Github page here; https://github.com/microsoft/AustraliaBuildingFootprints
The licence is Microsoft's Open Database Commons, meaning you can use the data as you need but you must attribute them, see licence conditions here
PSMA's Geoscape service has building footprints covering all of Australia; https://geoscape.com.au/product/
Unfortunately it is not free and charges are usually based on the size of the area you're seeking. Given the map in your question above, I'm going to guess that it will be prohibitively expensive (but doesn't hurt to ask).
There's always the DIY ...
Open street map has incomplete data of building footprints for Qingdao. There are many ways to download OSM data, including:
Do a quick but messy download of all OSM data in a given area from the map interface. (That link will take you to the area of Qingdao, but you'll want to adjust the bounding box before starting the download.
Or check out the OSM wiki ...
If you have a handful of stadiums and arenas only, then you might find a list online that suffices. For example, from Wikipedia global or US only.
If you need wider coverage, and also for many types of buildings, consider the following two options:
Option 1: Wikidata, with as an example some variation of arena (Q641226) and maximum capacity (P1083)
Two things spring to mind. Unfortunately these are building footprint datasets, so they mostly won't include building heights. There are ways around this at smaller scales, you could do zonal statistics on a digital surface model for example. But I'm unsure how to proceed for an area as large as you're seeking.
First off is Digital Globe's building ...