Update 2016-06-12: Added section with image & vocab lists from Oxford Dictionaries.
Here's a big post with lots of images, info, vocabulary and audio on the layout of an office: the different rooms and areas, and how they're used.
General info on offices
First off, the Wikipedia page on offices, which has info on office types, spaces, buildings, renting etc.
Overview of an office
Next, a general overview of an office from the Merriam-Webster Visual Dictionary. Click on the image to see its page in the visual dictionary, with image, definitions and more.
Things in an Office
Here's an image from the Oxford Learner's Dictionaries showing lots of things found in an office.
Have a look at these useful vocabulary lists about office and office life and work from Oxford. Click on each word for definitions, example sentences etc.
Office space layout / planning
By the way, when an office area is designed with a large area without walls, that's called an open office or open-plan office.
Detailed info on different spaces in an office
Next, I've made some image galleries from Wikipedia's section on different kinds of spaces in offices. Click on an image to see the name & info for that type of space, then advance right or left to see the rest.
Work spaces gallery
Senior managers often get (or aspire to) a corner office or an executive suite.
Meeting spaces gallery
Meeting spaces can be used for meetings (obviously), brainstorming, presentations, performance evaluations or appraisals, training sessions, coaching, mentoring, counselling, private conversations etc.
Support spaces gallery
Be careful about calling a room for where employees can relax a 'restroom'. In US English, that means a toilet / WC / bathroom. For a toilet, you can also use sexually specific terms like "the ladies' / the ladies' room" for women or "the gents'" (UK) or "the men's room" (US) for men. Although some offices might have a unisex toilet, for anyone to use.
Cafeteria / Canteen
I've also included an image from the Visual Dictionary for a cafeteria / canteen, which many employers have for their employees to eat in. Click on it for the dictionary page.
See also the Wikipedia page for more info:
Audio / Podcasts on Offices
Here's a podcast on rooms and spaces in an office.
(See my other posts tagged as office)
G.A.L.E.S.L. / joe3
Some tips and links on learning English.