Except for the science building, the Lunar Lakes rabbithole buildings are great for putting in basements. I've recently been working on building on Hylewood, a tiny island world with only 15 lots. All the rabbitholes are going underground on two of the lots, except for the mausoleum. I had room on the 23x22 lot where I built a library and a small building with the stairs to the basement, to build a small graveyard above ground. The basement contains the school, stadium, city hall, police, and military. And they all fit there neatly with only a little overlap with each other, and room in the center for a small underground park in the center, with streetlights, fountain, park benches, and potted plants.
I've just finally finished and have been taking pictures of all lots and residents, so I have a screenshot of the basement.
https://i.imgur.com/NRLJQda.jpg
Here's the basement of the 40x40 lot with the rest of the rabbitholes. I used the Bloom Wellness Center from Moonlight Falls for the science and hospital rabbitholes, because it's smaller than any of the science buildings. The pool is from the gym above ground.
https://i.imgur.com/lDD3yt8.jpg
You have to use MOO to put them there, but they don't usually show underground, no matter how tall they are.