riddle - Murder of the President - Part 4

This is Part 4 of the Murder of the President brainteaser/riddle series. If you have not already, check out the answers for Murder of the President - Part 1 posted by Nit and the answers for Murder of the President - Part 2 and Murder of the President - Part 3, both posted by Joe Z. Each part will give you a clue and you must solve it. Use all knowledge you have of cryptography, ciphers, past puzzles, etc. This question will have two different clues you have to solve. You should also use Google. This case is meant to take place in the present day, so all politicians, celebrities, places, etc. are who they are now. Please post your answers in spoiler tags.

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Here's the riddle:

You arrive back at the White House at 11:18 p.m. EST. You go into the Oval Office and you begin searching the President's desk. All of the drawers are open and filled with paper work, except one. It is the bottom left drawer, not too big and it has a lock with three number codes, the first with two digits and the second and third with a four digit codes. You ask for the codes to the desk, but you are told that no one knew them besides the President. Weird, you think. You are given a piece of paper that has some clues that the President wrote that are the codes to the desk. Weird, you think once again. But you don't have time to worry about that now.

Here are the clues.

The first one seems to be a riddle.

Before you figure out this password
There is a riddle you must master
You must first get the tower that looms

Then you must find the hollow moon

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The second one is just some words and letters that don't seem to make sense.

D.R.K Dahanu

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The thirds seems to be a code.

Down the Rabbit Hole²

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Once you manage to figure out the codes you open the drawer and, once again, you find a coded message.

Bl gl .l_cl_ QQI Z;;.D

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What are the codes to the drawer? What does this coded message mean? Where should you go next?

Good luck

Hint:

APPLE is in all uppercase letters. It is not an address. The 118 is not as important as the London part.

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Note: I will be posting Part 5 in one to two days. I will select the correct answer for Part 4 before, but I will post the answer for Part 4 if no one gets it

Answer

First numerical code is 10 (1 = tower, 0 - hollow moon, with credit to FortMauris for coming up with it first)

Second numerical clue is the Kaprekar constant: 6174

Lewis Carroll made frequent use of the number 42 in the novel Alice in Wonderland. 42^2 = 1764 for third number

There's a hotel called "The London" in downtown NYC at 151 West 54th Street. Presumably, it has a room number 118, so let's go there.