Answer: The Emerald arborvitae grows to 15 feet tall and about 4 feet wide so it is not really an ideal size for a foundation plant -- unless you have a very tall blank wall. This plant does best in full sun all day or in a half day of direct sun, about six hours including the hour of noon. In too much shade it will lean out from the building and will also grow thin and sparse. BAsed on your description I do not think you have enough sun there for it to do well in the long run.
Instead you might look at yews, boxwood, rhododendrons and Ilex crenata. These are available in cultivars that reach a reasonable size for foundation use and will also tolerate a partly shaded location (gentle morning sun) such as this. ALso, your local professional nursery staff may have additional or different suggestions based on a more detailed understanding of the growing conditions where you want to plant as well as your overall design goals.
Good luck with your project!
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