## CJam, <s>34</s> 31 bytes

    qN/W%zSf-La%{_{s'*&}#_)@@=}3*;\

This requires the input to be padded to a rectangle with spaces.

[Try it online!][2] Alternatively, [run all test cases.][1]

### Explanation

    qN/      e# Read input and split into lines.
    W%z      e# Rotate 90° counter-clockwise.
    Sf-      e# Remove all spaces from the rows.
    La%      e# Split into buildings. We've now got a 3D array of rooms, where the first
             e# dimension is the building, the second the room number and the third is the
             e# the floor number.
    {        e# Run this block three times. At each stage it will find the index of the "*"
             e# along the current dimension and leave the element at that index on the stack
             e# for the next round...
      _      e#   Duplicate the current array.
      {      e#   Find the index of the first element where this block yields something
             e#   truthy...
        s    e#     Flatten into a single string.
        '*&  e#     Set intersection with "*".
      }#
      _)     e#   Duplicate the index and increment it, because the results should be 1-based.
      @@=    e#   Pull up the array and the other copy of the index and select the
             e#   corresponding element.
    }3*
    ;\       e# We've now got the building, room and floor index on the stack, as well as the
             e# "*" character itself. We discard the character and swap the room and the floor
             e# floor number. When the three indices are printed back-to-back at the end of
             e# the program, that will yield the desired result.


 [1]: http://cjam.tryitonline.net/#code=cU4yKi97Ti9feixme1NlXXN9Tio6UTsKClFOL1clelNmLUxhJXtfe3MnKiZ9I18pQEA9fTMqO1wKCl1vTm99Lw&input=KgoKIyAgIyAgKiAgIyAgIwoKIyMjIyMKIyMjIyMKIyMjIyoKIyMjIyMKIyMjIyMKCiAgICAgICAgICMjIyMjCiAgICAgICAgICMjIyMjICAgICAgICAgICAjIyMjIyMKICAgICAgICAgIyMjIyMgICAgICAgICAgICMjIyMjIwojICAjICAjICAjIyMjIyAgIyAgIyAgIyAgIyMjIyMjICAqCgojCiMgICMKIyAgIyAgIyMKIyAgIyAgIyMgICMjIwojICAjICAjIyAgIyMjICAjIyMjIwojICAjICAjIyAgIyMjICAjIyojIyAgIyMjIyMjIyMKIyAgIyAgIyMgICMjIyAgIyMjIyMgICMjIyMjIyMjCgogICAgICAgICAgICMKICAgICAgICAgICAqCiAgICAgICAgICAgIwogICAgICAgICAgICMKICAgICAgICAgICAjCiAgICAgICAgICAgIwogICAgICAgICAgICMKICAgICAgICAgICAjCiMjIyMjIyMjIyAgIyAgIwoKICAgICAgICAgICAgICAgICAgICAgICAgIyMjIyMjIyMqCiAgICAgICAgICAgICAgICAgICAgICAgICMjIyMjIyMjIwogICAgICAgICAgICAgICAgICAgICAgICAjIyMjIyMjIyMKICAgICAgICAgICAgICAgICAgICAgICAgIyMjIyMjIyMjCiAgICAgICAgICAgICAgICAgICAgICAgICMjIyMjIyMjIwogICAgICAgICAgICAgICAgICAgICAgICAjIyMjIyMjIyMKICAgICAgICAgICAgICAgICAgICAgICAgIyMjIyMjIyMjCiAgICAgICAgICAgICAgICAgICAgICAgICMjIyMjIyMjIwojICAjICAjICAjICAjICAjICAjICAjICAjIyMjIyMjIyM
 [2]: http://cjam.tryitonline.net/#code=cU4vVyV6U2YtTGEle197cycqJn0jXylAQD19Myo7XA&input=ICAgICAgICAgIyMjIyMgICAgICAgICAgICAgICAgICAgIAogICAgICAgICAjIyMjIyAgICAgICAgICAgIyMjIyMjICAgCiAgICAgICAgICMjIyMjICAgICAgICAgICAjIyMjIyMgICAKIyAgIyAgIyAgIyMjIyMgICMgICMgICMgICMjIyMjIyAgKg