I enjoy reading these debates over why some things are in Kino, so I'm just going to add to this.
Ok, so the Berlin Wall was built in 1961, and it is present along with an unfinished building that was finished in 1969, the reason for those things being there as the way they are is because of the zombies.
Think, how did the crew get to Kino? Through the teleporters. Are they the only ones who have access to these teleporters? Maybe. What if this place is set in the 60s or 70s? The reason for the structures outside of Kino could be explained because of the consequences of using the teleporter. Due to the zombie invasion, the construction of these structures could have been stopped. I'm not sure if the Berlin Wall is finished in Kino, but if it is, it may have been because the people thought of using the wall as protection.
Lets put something else as a factor to determine the time, Ascension. The crew gets to the Ascension site through one of the Lunar Landers. In the map, if you activate the red phones, you will hear sounds coming from Five. This indicates that Five and Ascension are set in the same time. Kennedy was alive during the early 60s. Which map occured first, Kino or Ascension? If it is Kino, then Kino must take place during the 60s, before Ascension, but if Kino is after Ascension, then it may be in the 70s. Remember, Kennedy and his crew are presented to zombies for the first time in Five, so time was not altered at this time yet.