Here is a basic form - your neighbor would have to go and get it recorded so that it is of record notice regarding the property.
______________________________, (Grantor), being the owner of the following described real property:
AND, _______________________________, (Grantee), being the owner of real property adjoining or adjacent to the above cited property, which adjoining property is described as follows:
AND Grantor, having received good and valuable consideration, receipt of which is hereby acknowledged, on behalf of himself, his heirs and assigns, DOES HEREBY GRANT to Grantee, his heirs and assigns, a perpetual easement for the following purposes:
to go through, over and across the Grantor's above described land.
__________________________________________
GRANTOR
Sworn and subscribed before me this ____ day of __________ , 20__.
__________________________________________ My commission expires:
Notary Public
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Lawyer (JD)
LL.M Harvard - Contract law focus; Taught 3 years at Univ. of WA law school