Address with number/a or number/number

Hi,

Does residential address with the following:

(i) number as number/a, number/b, e.g. 1a or 1b; and,

(ii) number as number/number, e.g. 1/1, or 1/2

…means that the the owner does not own the land outright, and the land is shared with another accompanying owner?

i.e. can I assume the address is either duplex, semi-detached, or share a common wall?

I am filtering houses that stand on their own, i.e. no shared common wall or sublet, and to own the land in my residential real estate search.

This is important in case I want to knock down the house and rebuild a new one; so I would not have to ask for nearby owner’s approval.

Many thanks.