Multi units only showing one address

[Alice Chau]

Hello all,
I am currently in escrow for a duplex in CA that has 2 distinctive street numbers but during escrow, it is only showing one street number in title.  I asked the real estate agent, and she said that this is normal because the purchase is based on the land parcel.   As long as the second unit is on the parcel although the street number is not listed, then it is still ok.  I want to know if this is really normal and should I be worried?  What kind of documentation I should ask as proof to show that I am really purchasing the duplex not a single family home for the price?

Thanks in advance,

Alice