Differences between residential and commercial retail/office

[Bryan N.]

So, I've been a landlord for a few years now.  I think I want to venture into commercial real estate for retail or office locations.   What are the big differences between residential and commercial?

For example:

I self manage

Wrote my own lease

I advertise, show and lease sign

I don't need an agent or PM

I've been doing some reading on commercial properties but I don't seem to find a lot of info on being self sufficient in the areas above.  That information is readily available for residential Landlording.  

Any help with the info above?

When it comes to analyzing a deal I believe it's basically the same as a residential but maybe some other variables?