Memorabilia (I've seen a reference to this before, but thought it'd be interesting for some people.)
Forgive me if my interpretation is wrong, but it appears there may be "Mini Games" that could potentially be included for each building. The coding works like the Homer's Buddha/Mystery Box/Leprechaun Tap; a Random # is generated, then used to determine the prize gained. The odds of winning a prize from a building are 66%, with odds of each listed item being:
1st Item Listed: 5%
2nd Item: 10%
3rd Item: 14%
4th Item: 17%
5th Item: 20%
= 66% Total Odds/ the other 33% of the time results in no prize. Each item has a cost of 1 donut assigned to it. I'm assuming that's the cost of playing the "mini game"
Here are the items listed for each building (these are the only buildings listed so far). Again, this is just data from the files, I'm not saying this will be implemented, just that it's a possibility.
Simpsons: Krusty Doll, Boat picture, Slingshot, Lisa's Sax, Ned's Lawn Mower
Flanders: Bible Card, Religious Board Game, Last Supper, Bible, Maude Picture
Power Plant: Carbon Rod, Suit Helmet, Security Badge, Demotivation Plaque, Burns Painting
Kwik-E: BuzzCola, Squishee, Play Dude, Old Hot Dog, Laramie Cigarettes
School: Apple, Globe, Malk, Dodgeball, Beethoven Bust
Willie: Rake, Mop & Bucket, Kilt, Flask, Bagpipes
Frink: Beaker, Test Tubes, Hamburger Earmuffs, Brain Helmet, Push Popper
Krusty Burger: Milk Shake, Mother Nature Burger, The Clogger, Employee Hat, Employee of the Month
Church: Collection Plate, Podium Banner, Book of Hymns, Bible, Stain Glass Saint
Van Houten: Alf Pogs, Pajamas, Bonestorm, Baron Von Kit, Krusty Walkie Talkie
Cleetus: Old Boots, Roadkill, Shotgun, Musical Jug, Geech Smell Hound
Android: Bootleg Videos, Mary Worth Phone, Ultimate Pog, Angry Dad Comic, Radioactive Man Comic
Lard Lad: White Donut, Pink Donut, Chocolate Donut, Plain Donut, Purple Donut
Moe's: Pickled Eggs, Bar Stool, Cockroach, Beer Mug, Flaming Moe
Town Hall: Mayor Sash, Vote Quimby Sign, Town Charter, Money Brief Case, City key
Retirement: Pill Tray, Bingo, Ointment, Dentures, Sex(?) Tonic
Police Station: Empty Donut Box, Wanted Poster, Wiggum Police Hat, Wiggum Gun, Wiggum Badge
Dog Track: Discarded Wager Tickets, Ticket Stub, Track Rabbit, Dog Jacket, Winners Wreath
Luigi: Pizza Box, Chef's Hat, Bottle of Wine, Accordion, Picture of Italy
Prison: Lunchtray, Taser, Prison Jumpsuit, Straightjacket, Die Bart Die
Gilded Truffle: Matchbook, Valet Parking Stub, Fancy Menu, Tin Foil Swan, Fancy Wine
Duff Brewery: Duff, Duff Lite, Raspberry Duff, Lady Duff, Tartar Control Duff
Library: Silverfish, Turtle, Old Computer, Mables Table, Audiovisual Terminal
Observatory: Meteorite, Buttzila, Microscope, Doomsday Whistle, Telescope