関係者以外立入禁止

I took this picture near an apartment building near my apartment building. I shared some of these on my Vine feed but might of missed this one.

Not to mention the nice reflection of my shoes, how do you like them?

関係者（かんけいしゃ）- People/Personnel
以外（いがい）- Except for/Only
立入（たちいり）- Entry
禁止（きんし）- Prohibited

Translation 
関係者以外立入禁止 - Authorized Personnel Only

Grammar Note
―以外
This is a conjunction Kanji that needs a noun or pronoun before it to show the 'exception'.

Examples:
私以外- Except for me
犬以外- Except for dogs
女性以外- Only women

以上です。

ジョシュア