Know a good plumber, roofer, window washer, etc?

As some may know, my family owns and operates two self storage facilities. We are always in search of good commercial contractors for various trades. Right now we are very happy with the electrician and concrete person that we use, so that is the only trades we don't need a referral on. All of the rest I would consider switching if they did quality work and charged a reasonable price.

Does anyone have friends or family (or anyone else that you can refer) that is licensed to do commercial work? I'd love to be able to serve our needs and help out a reader of Heather's blog.

Some of the trades we are looking for include, but are not limited to, plumbing, landscaping, heating & air conditioning, roofing, pest control, finish carpentry, painting, flooring & tile work, locksmith, door repair, welding, banners & signs, and general handymen. Basically, we have need for almost every trade and one time or another. The plumber and electrician will get a lot of business from us this year (unfortunately). Keep in mind that they need to work in the LA & Orange County, California markets.

Thanks for your help. Also, let me know if you every need a referral for any of these trades. You may get a better deal with our referral.