Another reviewer here has compared this to Return of the Living Dead. That is nuts. Return of the Living Dead had an incredibly solid and witty script and actors with the charisma and talent for humor to back it up, as well as some excellent effects for its time. This movie has none of that.
There are a few minor chuckles in here, I'll give it that much credit, but nothing worth sitting through the rest of this. The effects are standard generic low budget horror level. The actors aren't that bad, but they aren't good enough to make this derivative, lukewarm script enjoyable. Now, I'm not going to be so dramatic as to claim that this is one of the worst movies I've ever seen, I've seen much worse than this, but this is still nothing more than a regretful waste of time unless you have really low standards when it comes to horror and/or comedy.
You want a horror comedy about vampires in an office building? Go watch Bloodsucking Bastards (2015) instead. That one's actually funny and enjoyable.