sims 3 into the future city not showing up

oasis landing is a sub hood  like uni or world adventures a time portal will appear on your lot if the lot is big enough if not the portal will appear in the world you are playing you then inspect the time portal which makes emit the time travler  appear he gives you a small quest to gather 5 power cells that appear near you pick them up give them to emit he will fix the portal he also gives you a time almanac then you travel to the future world oasis by clicking on the portal , the only difference with oasis landing is you can stay there as long as you want (unlike with WA or UNI you only stay x amount of days there)  if the portal does not appear in your world within 24 sim hours then you can buy one from build/buy if you don't want to wait for it to appear  (the portal usually appears immediately and you get a notice about it appearing in your world  go to map view to see if it is your world you are playing in then send your sim to inspect the portal  )