Harmful pillar or harmless wall?

[myfs_98767]

Dear Master,

In many fengshui books, there is always mention of
pillars and its problems.

But how do we define pillar? On the left of attached
photo is how my office building looks externally.
I have marked an arrow pointing at something which
looks like a pillar.

The right photo shows what is behind the circled
portion of the left photo. This is essentially a
corridor and my office main door is facing the said
wall (the red arrow points to my main door).

Hence is it harmful or harmless that my office main
door is facing this piece of wall? Especially if it
seems to darken my stretch of corridor?

Please advise, thank you.

Regards,
Sean