CheckboxList, MVC, Many-To-Many Relationship

I have a Request class and a Building class with a many to many relationship. A Request can be associated with 1 or more Buildings. I want to take advantage of EditorTemplates to generate checkboxes for each building and check them if associated with the Request.

This might seem like a bit of a loaded question but I'm familiar with EditorTempaltes, ViewModels, etc. I'm just not quite sure how to wire the two up with a many-to-many relationship and checkboxes.

1. Do I need to add a bool property to my Building class to indicated checked status?
2. For the EditorTemplate how do I indicated status of checked with the many-to-many relationship?
3. Should I add 开发者_运维知识库an IEnumerable<Building> to my Request viewmodel?

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See Many to many checkbox and mvc