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Since I am the chair of a new committee, I am being challenged by my loyal committee members. What is the proper use of "which" and "that" in the following sentences and what is the general rule that applies?

" The Board of Directors has adopted this Design Guidelines Document "which"/"that" establishes detailed guidelines related to permitted and prohibited changes to the lots and/or structures."

"Nothing shall be kept or stored on the exterior of the lots or common areas "which"/"that" would create an unsightly condition."

"The design guidelines cannot envision every possible modification "which"/"that" might be proposed by community members."

This last one is just a question on the singular tense of object closest to the word "knows".

"It is each member’s interest to have read this document and "know"/"knows" what is or is not generally acceptable; in cases where this document is not clear, please refer to one of your ARC members for assistance."
Thank you! Chair
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The Board of Directors has adopted this Design Guidelines Document that establishes detailed guidelines related to permitted and prohibited changes to the lots and/or structures.

Nothing shall be kept or stored on the exterior of the lots or common areas that would create an unsightly condition.

The design guidelines cannot envision every possible modification that might be proposed by community members.

It is each member's interest to have read this document and knows what is or is not generally acceptable; in cases where this document is not clear please refer to one of your ARC members for assistance.

- Comma was optional because the sentence is fairly short and does not make it ambiguous if ommitted. However, to be safe, use comma.
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Thank you for your post.
Best regards,
Chair.
Sometimes the differences between that and which can be subtle. Some writers use either which and that when which should be used, which is fine, but only in instances that it wouldn't make much difference or stylistic reasons.

If you notice the sentence before this, I used which because whether which is fine is present or not, the meaning of the sentences does not change--this is how you determine whether to use that or which most of the time.