Here's a small, simple, functional, no frills apartment complex on a tiny lot that won't lag your game! No CC! Requires Apartment Life and nothing else if you use Clean Installer. Sans Clean Installer you'll need all the EPs.
Comes with 5 apartments. Rent is 5480 + 954 a month for the bottom level, and 5470 + 1188 for the top level. Each apartment has 1 bedroom, 1 bath, except for the one on the top left, which will be home to the Caliente sisters in F&R.
ETA: Reuploaded to fix that unfinished edge on the top. If you want to edit the outside or walls of the apartment, use the "changeLotZoning residential" cheat and change it back when you're done using "changeLotZoning apartmentbase".
jenga218 has made a highrise version of these with eleven apartments, which you can download here.