Does a Co-op = I person 1 vote?

We are having a discussion about how the votes are allocated in our housing units.
Some have said 1 person 1 vote is a defining feature of a co-op and its democratic structure.
Others say it should be 1 tenancy 1 vote because 1 person 1 vote could mean that a smaller number of housing units have more power as they have more votes. They could out vote the single people who live in a larger number of units. If it is 1 tenancy 1 vote and votes are cast through consensus then the idea is there would be discussion within each tenancy about how they should vote. This also a way under 18s can have a say in how the vote of that unit is cast. For these reasons it is argued that it 1 tenancy 1 vote is more democratic .

Any thoughts?