looks like an exposure problem. Are you using photometric lights? If so make sure to work in a proper scale. (set scale units to metric or inches) realistic lighting is based on realistic measures. That way you can really be sure of what you are doing.
Also as a tip, create a matte arch and design material and put it in the material override in the render setup (processing tab) work with only one material for initial lighting it'll help and it will be faster as well.
Make sure you are working in a linear workflow, you need to know if you are planning to use a compositing application or if you prefer to have a final render straight from max and maybe retouch it in photoshop.
If you are planning to work in archviz, or doing stills without
a compositing program then set your settings like this:
if on the contrary you are planning to work with a compositing package such as nuke or after effects, set your "output gamma" to 1.0, as your compositing application will interpret it as linear (sRGB) .
Also. If you are working with a compositing package you wont be using "mr exposure control" (well you can still use it for test renders...only) because when using render elements, exposure wont be taken in consideration, exposure works only in master beauty. But if you are working compositing "render elements" (render channels) you will be applying exposure in your compositing package of choice.
And finally if working with render elements (channels) use mr AD output channels (they are the result of mr AD level & mr AD raw output together. You can eventually choose raw or level... but to start stick with output (result) channels.
Hope this helps man!