The situation
One neighbor was about to decide shared bicycle-space usage alone.
English meaning: It's a space we both use, so let's discuss it before deciding.
Read the Japanese original
お互い使う場所ですし、相談して決めましょう。The questionWhat is the focus of the suggestion?
Read the explanation
Clues in the scene
It's a space we both use, so let's discuss it before deciding.
Shared use is explicitly given as the reason to discuss the decision together.
Each choice explained
Coordinate among people sharing the space — Best fit
The proposed process is discussion among the people who use the space, rather than one-sided decision-making.
Give the speaker sole authority — Does not fit
No transfer of sole authority to the speaker is requested. That conflicts with the emphasis on shared use and discussion.
Ban all use permanently — Does not fit
The proposal concerns how to decide on use. It does not permanently prohibit everyone from using the storage area.
Report that consultation is already complete — Does not fit
The discussion and decision are still ahead. Reading this as a completed agreement reverses the sequence.
Same words, another scene
Everyone has already agreed on the main layout principles. Only the locations of two bicycle spaces remain undecided when the same proposal is made.
Discussion is still needed, but not necessarily a restart of every decision. The unresolved item defines its scope.
Shall we keep the agreed principles and decide just these two positions together?
Literal meaning
A proposal to discuss the decision because both people use the space.
What these words cannot tell us
Who must take part, whether voting or unanimity is required and what existing rules apply are not stated.
A question to ask in real life
Shall we confirm who needs to be involved and which points remain undecided?