This is my first contribution, so please forgive me if I haven't submitted properly.
I am very surprised that no one has suggested the guitarist is tuned down a half step (Eb tuning)
So many guitarists tune down (Van Halen, Extreme, Vertical Horizon, etc.) when playing acoustic.
Tuning: Eb - Ab - Db - Gb - Bb - Eb
Now it's only a matter of playing a "country" C chord, adding the third fret on the high Eb string.
I don't hear a 7th in the Gm chord, but it's certainly an alternate.
I like the Ebsus2 up on the 6th - works nicely with the keyboards and solo guitar.
The "pièce de résistance" chord - I don't mind the suggested Gm7b5/C#.
One might contest that if the root were C#, and the C is truly heard, the chord might be a C#maj7/6.
But an easier chord could be a simple C#6 bar chord.
Dm chord - depends on the "colour" you wish to add and where.
I've listed three versions that I think could work - take your pick.
I think the third position Dm works well for the piece between the Chorus and 2nd Verse.
C Gm(7) Eb2 Eb2/D Fsus2 C#6 Dm7 or Dm9 or Dmsus2 F Gsus7
eb|-3---/-3----/-6----6----/-3-----/-6----/-1------0------0----/-1----/-1----
Bb|-1---/-3----/-6----6----/-1-----/-6----/-1------1------6----/-1----/-1----
Gb|-0---/-3----/-0----0----/-2-----/-6----/-2------2------7----/-2----/-0----
Db|-2---/-5----/-5----5----/-3-----/-6----/-0------0------6----/-3----/-0----
Ab|-3---/-5----/-6----5----/-0-----/-4----/-x------x------x----/-3----/-2----
Eb|-x---/-3----/-x----x----/-1-----/-x----/-x------x------x----/-1----/-3----
____________
[Intro]
C - Gm(7) - Ebsus2 - Ebsus2/D - Fsus2
C - Gm(7) - Ebsus2 - Ebsus2/D - F#m7b5/C
[Verse]
Dm7
Came in from a rainy thursday
F Gsus7
on the avenue
Dm7 F Gsus7
thought I heard you talking softly
Dm7
I turned on the lights, the tv
F Gsus7
and the radio
Dm7 F Gsus7
still I can't escape the ghost of you
[Bridge]
Dm7
What is happened to it all?
Am
Crazy, some say
E F
Where is the life that I recognize? (Gone away)
[Chorus]
C
But I won't cry for yesterday
Gm(7)
there's an ordinary world
Ebsus2 Ebsus2/D Fsus2
somehow I have to find
C
And as I try to make my way
Gm(7)
to the ordinary world
Ebsus2 Ebsus2/D C#6
I will learn to survive
(Here, if you use the third position of the Dm I've suggested, you can add the notes on the high Eb string
on the 7th fret, then 5th, then drop to an open Eb)