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Using _ViewStart on areas for nested content
@{
   Layout = "~/Views/Shared/_Layout.cshtml";
}

<html>
        <div>
            //header
        </div>
        <div>
            @RenderBody
        </div>
    </html>

@{
    Layout = "~/Views/Shared/_Layout.cshtml";
}
<div class="row">
<div class="sidemenu">
    //default sidemenu for this area
</div>
<div>
        @RenderBody()
</div>
</div>