RewriteEngine On
RewriteBase /

RewriteRule ^$BASE/(.*)/templates/(.*) /bm-content/blogs/$1/templates/$2 [L]
RewriteRule ^$BASE/(.*)/images/(.*)    /bm-content/blogs/$1/images/$2 [L]

RewriteCond %{REQUEST_URI} !^$BASE/index.php/
RewriteCond %{REQUEST_URI} !^$BASE/bm-

RewriteRule ^(.*) $BASE/index.php/$1 [L]