As you fall from the giant clock tower, watch some flashbacks. When you awaken, there is a cutscene. Howard the Mailman shows up. He has something for you. It's a letter, addressed to you. The front of the envelope says:

Murphy Pendleton
St. Maria's
5 Mitchell Dr.
Silent Hill

The postman explains that this letter is from St Marias, the old orphanage up there on the hill. You tell him that it's gotta be a mistake, but he tells you to open it, since it has your name on it. But you get upset, telling him you've had enough of these riddles and mind games, throwing the letter to the ground. You want out.  The mailman tells you that it doesn't matter what you want. As for him, he has got mail to deliver. He puts the envelope in your hand again. Cutscene ends.

At this point, for escaping the Centennial Building and the Otherworld inside, you should get this achievement/trophy:

Whatever doesn't kill you
Escaped the Radio Station Otherworld

You also receive a new objective:

Inquire at the Monastery
Howard gave me a letter, said I'm needed at the monastery on the hill overlooking town. I'm sure it's some kind of trap. This town... It wants to destroy me, doesn't it? Still... I feel like I need answers.

You find yourself on Lamon Ave in Chastain Heights,  between the Movie Theater and Centennial Building. Explore the street for any useful items, including some new weapons on the ground and a first aid kit in the north and another one close to the barrier on the south. A bit to the north there is an apartment building which you can enter. Inside you can climb some stairs and reach a locked door. This is part of the Ribbons quest, which we covered in Part 18 of our walkthrough. Once you are done exploring this street, enter the movie theatre. The entrance is in the south end of the Lamon st near the chasm.

Explore the movie theater. Enter the restrooms, and pass through an opening in the wall. Inside the theater, climb up. Look between the rows for a first aid kit on the floor explore a small room with some posters. Go to the other side, and climb the stiars to reach the projector room. As you examine the projector, you realize the bulb is missing, requiring you to fix the projector.  On the wall, there is a mystery item:

Picturedome Projection Services LLC.
Film Splicer WC40
Film Splicing Guidelines.

Projector Lighbulb Location
The location of the light bulb will be different depending on your puzzle difficulty setting. On easy, it is in the poster storage room, which you can enter from the back row of the movie theater. On normal and hard difficulties, the light bulb is not actually in the movie theater area. You need to exit the cinema, go south, turn right to an alley, climb some stairs, and go south on Brite St. As it turns east, take a detour to the SW to locate the Hardware Store. See the map below.

Downpour Cinema Verite Side Quest Hardware Store map

1: Movie Theater
2: Hardware Store (Replacement Bulb Location on Normal and Hard)

In this hardware store, locate the replacement light bulb on some shelves near the cash register. You receive:

Replacement Bulb
For use in a movie projector.

Also, while you are here, open the register to find a storage room key, Use it to unlock a door nearby and find a painting, "Hope", needed for the Art Collector Side Quest. Go back to the movie theater after exploring the hardware store.

Back at the Cinema, return to the projector, open your inventory and select the replacement bulb. Murphy repairs the movie projector. Now that it works again, you want to use it to play a film. Collect the following film reels from around the movie theater building: (You might have picked some or all of these up already at this stage)

1st Film Reel - "The House on the Lake"
On easy and normal, this first film reel will be near where you entered the movie theater, on top of a coat check counter. On Hard difficulty, this will be on a knocked over vending machine in an area near the concession counter.

2nd Film Reel - "The Silent Children"
On easy and normal difficulties, locate the door with the circular window and the flickering light, close to the concession stands. These are the restrooms. Find this reel in one of the stalls. On Hard difficulty, this reel will be behind the theater seats in the back row of the movie theater. Go through a hole in the wall and climb to the back row and look for it there.

3rd Film Reel - "The Secret of the Attic"
This one is in a small movie storage room near the projector room, no matter what difficulty you are playing on.

The instructions for this side quest are continued in the next part of the walkthrough.