app/views/layouts/two_columns_with_map.html.erb
<!-- Span 6 -->
<div class="row">
<div id="column1" class="col-md-6">
<div class="row">
<div class="map_container">
<%= yield :map %>
<div id="map-canvas"></div>
</div>
</div>
<div class="map_legend">
<%= yield :legend %>
</div>
</div>
<div id="column2" class="col-md-6">
<%= yield %>
</div>
</div>
<%= parent_layout 'application' %>