[Momo relies on his eyes and ears to figure how likely it is they might run into trouble, but also largely keeps to the alleyways when he can, rather than streets. Both on the logic that any force that's going to be in an alleyway won't be a very large one, and that most of the antagonistic parties are going to be focusing on where they can do the most damage, which is where all the people are.

One or two thralls that have wandered a bit too far from their owner need Momo to drop one arm from Mikasa to deal with, using his elemental magic to freeze them in place so he doesn't have to spend more time than that dealing with them (or risk that whoever's controlling them might sense one being cut off). Finally, however, they pass a nondescript, sturdy-looking building that appears intended for practicality and very little else, and Momo darts into the doorway, opening it and heading through before anyone else shows up on the street they're on closer than the fight that seems to have broken out a few blocks down from where they are.

It takes him a moment to figure out what it is in comparison to his own world, but an advertisement for special stamp designs to commemorate the anniversary of the revolution gives it away.]

Well, it's not what I thought of originally, but post offices are usually pretty solid too. There's still plenty of old ones around in my world.