Although nested resources are an acceptable way to handle this feature you could also make them both top-level resources:

```ruby
resources :owners, only: [:new, :index, :create]
resources :buildings, only: [:new, :index, :create]
```

Then rather than using a nested route (e.g. `/owners/1/buildings/new`) you can just include a dropdown menu on the new buildings page where they can optionally select the owner.