Thanks, yeah, it´s the "beginner level" Piko loco depot. It´s quite affordable, but has that plastic sheen all plastic kits have.
I´ve drybrushed the roof and and washed the brick and metal areas with a dark wash. That alone helps alot already. Plus there are some off-coloured bricks and some modest graffiti. Unfortunately I didn´t do the mortar between the bricks (white wash) but since the building is glued on it´d be a pain to do this...not sure if it´s worth the hassle.