Where do you post ads for Commercial Leases - Office Space?

[Will F.]

Where do you post ads for commercial leases available?  We have a large office space we're trying to rent out in Los Angeles.  

Is there a place like postlets where you can syndicate it to a lot of websites?

I've already posted an ad to Loopnet- they charged $250 for 3 months and I haven't had any bites...It's a lot easier to find places for residential rentals than commercial.

Any tips for putting a commercial lease on the MLS?