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Question: can a contract and addendum be signed at the same time if both parties agree?
Answer: YES. While it is a bit unusual to do so on the same day, it is neither illegal nor unheard of. The parties simply have to make the verbiage in the addendum be clear that it is an addendum to the primary contract.
The addendum requires all the same elements of the contract -
1) names of parties sought to be charged;
2) subject matter;
3) terms and conditions;
4) consideration; and
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