Ah, I saw "feature" through "feature4" on several blocks. I'll have to look at some of them, extract OBJs to get a look at UV mapping, and figure out if it would be feasible to make one overall MAT. If not, it might still be worthwhile to make some block-specific signage MATs. I really like your idea of using those mat zones for neon signage. :D

So far, I have a universal MAT for LED green, LED red, lamps, beacon, window A, window B, window C, plus a dull transparent glow for "void" (parking garages) and a disappearing material for the "ground base" to let my own asphalt show through.
I also have automatically animated textures for the LEDs and beacons, so that the LEDs pulse (brighten... dim... brighten... dim..) and the beacons strobe (flash-flash-flash-pause... flash-flash-flash-pause...). For neon signs, UV mapping permitting, I could set up animated theatre crawler effects.

Poser 12, in feet.  

OSes:  Win7Prox64, Win7Ultx64

Silo Pro 2.5.6 64bit, Vue Infinite 2014.7, Genetica 4.0 Studio, UV Mapper Pro, UV Layout Pro, PhotoImpact X3, GIF Animator 5