Bava Batra

A man's vessel acquires for him ownership  everywhere  except in reshuth harabbim. But both R. Johanan and R. Simeon b. Lakish have stated: Even in reshuth harabbim. R. Papa said: There is no dispute [at all] between them. The former  speak of reshuth harabbim; the latter,  of an alley. Then why do they call it public territory?  — Because it is not private territory.  This  may also be proved by logical deduction; for R. Abbahu said in the name of R. Johanan: A man's vessel acquires ownership for him wherever he is permitted to set it down. From this it is to be deduced that [only where] he is permitted [to set it down],  he does [acquire ownership]; [but where] he is not permitted,  [he does] not. Come and hear: Four  [different] laws [are applicable] to sales.  Before the measure  is filled, [the contents remain in the possession] of the seller.  When the measure is filled, [the contents pass over into the possession] of the buyer.  These laws apply to a measure which belonged to neither of them,  but if the measure was [the property] of one of them, he [whose measure it is] acquires successive possession of every single unit of the quantity as soon as it is put in.  These laws, [furthermore], apply to a reshuth harabbim and to a courtyard which belongs to neither of them,  but [if the purchase was] on the premises of the seller, [the buyer] does not acquire possession  until he has lifted  it or has removed it from the seller's premises.  [If the purchase was] on the premises of the buyer, he acquires possession as soon as the seller has consented [to the terms of the sale].  [If the purchase was] on the premises of one with whom it had been deposited [by the seller]. possession cannot be acquired [by the buyer] until [the owner of the premises] has consented  [to allow to the buyer a portion of his premises on which to effect acquisition of ownership], or until [the buyer] had hired the place it occupies. At any rate, it is taught here [that possession by means of one's vessel may be acquired] in reshuth harabbim and in a courtyard which belongs to neither of them.