Scavenger Hunt

I've always wanted to do a real scavenger hunt. When our good friend, Jason (we met Jason in Japan; he visited Munich a few weeks ago), told us that he left us a message in "the last page of the guestbook at the top of the new town hall tower in the Mareinplatz in Munich" I was very excited. Since I loved the experience, I thought you'd like to come along on the journey :)
There's the clock tower in the distance...

We reach the Marienplatz...

Ready to go up...

Up the first elevator...

Tower this way...

Enter here.

Up the second elevator...

We spotted the book.

The last page.

The message written just for us!

Can you decode the message? Can you guess WHO the message was for? 5 billion points to whoever knows the answer.
Ok, just for humoring me and my game playing ways, here's a present. A peek at the view from the top :)

Thanks for the fun Jason.
I have a ton to write. We have already experienced so much on our little journey, so I'll post soon.