I found the video tutorial above that showed me someone creating a New York style building asset in about 40mins using Maya. Be warned; I had to turn the volume up on my laptop to hear it, and then he spent a lot of time talking quietly to himself - although that was mostly him thinking aloud about what shapes to make things and stuff like that... But other than that, it was worth watching to me.
I tried following along in Blender, and succeeded! Here's a screenshot of the wireframe and a render I lit with some coloured lighting.
Definitely need to figure out how renders work...
The lighting was partly for fun... I'm likely to spend some time at some point learning how to light things properly and better, but I thought this would do for now since I'm focusing on learning the modelling tools first.