+0
Hi, please help me.

"Land prices are now down to the level of 15 years ago."

Is this sentence natural? It is odd to me that the adverb phrase "15 years ago" is placed after "of."
+0
It sounds fine, Tashiro. '15 years ago' is a 'point' in time, just like '1995': Land prices are now down to the level of 1995.

And I think that the prepositional phrase is an adjective modifying 'level'.
+0
the level of 15 years ago is the level that they had 15 years ago. That's a natural thing to say.

of can thus mean "associated with".

CJ

Edit. Mr. M. wasn't there when I answered.
Students: We have free audio pronunciation exercises.
Comments  
Thank you for the reply.
 CalifJim's reply was promoted to an answer.
Teachers: We supply a list of EFL job vacancies