I was working through a similar issue based on the advice from this post and something like this example may work for you. In my case, it was a true/false field then a custom date.
$args = array(
'post_type' => 'Property', // post type
'meta_query' => array(
borough_clause => array(
'key' => 'the_borough',
),
order_clause => array(
'key' => 'the_order',
),
),
'orderby' => array(
'borough_clause' => 'ASC', // assuming borough alphabetical
'order_clause' => 'ASC' // assuming custom order is 1 2 3 etc
),
'posts_per_page' => -1, // inlcude if you want all posts
));