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Which preposition is used for the following and why?
1) The theater is on/at 38 Darling Street.
2) Deliver the pizza at/on 38 Darling Street.
1) The theater is at 38 Darling Street.
(you are referring to a specific address)
The theater is on Darling Street.
(you are referring to a general area)
2) Deliver the pizza to 38 Darling Street.
(Neither "at" nor "on" are correct. Since there is movement is involved
you must use a Preposition of Movement)
Which preposition is used for the following and why?
1) The theater is on/at 38 Darling Street.
2) Deliver the pizza at/on 38 Darling Street.
1) The theater is at 38 Darling Street.
The preposition at refers to a specific point in space, in this context.
2) Deliver the pizza to 38 Darling Street.
The preposition to indicates "in a direction" or "towards" and it functions as a preposition of place in this sentence.
Prepositions of place 
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