Spanish to English Tech/Engineering Architecture

Describing a prominent building in the Canary Islands, it is said to have a "mareado eje vertical que viene dado por la puerta de ingreso y dos balcones". I understand the rest of the sentence perfectly but have never seen "mareado" used in this sense.

The RAE gives:

"mareado, da.

(Del part. de marear).

1. adj. Dicho de un libro: Que presenta manchas producidas por descomposición del papel."

So stale, musty, yellowing...

I have managed to find a photograph of the building, which you can find at http://bit.ly/mm6ljs

This seems to suggest that "yellowing" (or rather, pale yellow or something along those lines) may not be too far off, but I'm not overly confident. This solution also fails to account for how this "eje mareado" can be formed by the balconies and entrance, unless what it's getting at is that it has a yellow façade punctured by these fixtures.

Any ideas would be much appreciated!