Check out this cool add-on that simplifies the creation of city environments in Blender.
The developer notes, however, that the default CITIGEN assets are very detailed, so you might need high-end GPU cards if you want to go over 100 * 100 blocks. On the other hand, it is possible to replace them with low poly building assets and go as big as you want, this is up to the individual artists to decide.
In the future, the team promises to add highways and rivers, improve the quality of the default assets, add more CITIGEN camera rig options, and more.
You can learn more and get the add-on here. Also, don't forget to join our new Reddit page, our new Telegram channel, follow us on Instagram and Twitter, where we are sharing breakdowns, the latest news, awesome artworks, and more.