I work in a real estate company. I see a girl get up before dawn every day. I like her very much. I don't know how to approach her. Is it appropriate to tell her?

I don't think you should tell others directly, although you may interrupt you inadvertently several times. You can try to say hello to her every day, talk more slowly and get to know her better. If you really think she is right for you, then confess. Don't be impulsive, because impulse is the devil! Come on!