epl_listing_load_meta_commercial_rent_period

You can modify the commercial lease rates with epl_listing_load_meta_commercial_rent_period filter.

How to modify the filter

function my_epl_listing_load_meta_commercial_rent_period() {
	$defaults = array(
		'annual'		=>	__('P.A.', 'epl'),
		'nnn'			=>	__('NNN', 'epl'),
		'full-service'		=>	__('Full Service', 'epl'),
		'net-lease'	=>	__('Net Lease', 'epl')
	);
	return $defaults;
}
add_filter( 'epl_listing_meta_commercial_rent_period', 'my_epl_listing_load_meta_commercial_rent_period' );

Defaults 

/**
 * Custom Meta: Commercial Rental Period
 *
 * @since 2.1
 * @return all the categories in array
 */
function epl_listing_load_meta_commercial_rent_period() {
	$defaults = array(
		'annual'		=>	__('P.A.', 'epl'),
		'nnn'			=>	__('NNN', 'epl'),
		'full-service'		=>	__('Full Service', 'epl'),
		'gross-lease-rates'	=>	__('Gross Lease Rates', 'epl')
	);
	return apply_filters( 'epl_listing_meta_commercial_rent_period', $defaults );
}