Custom FilterAPI that hard codes an additional condition to the default "My Accounts" filter

CustomFilterAPI.php

<?php

/* File: ./custom/modules/Accounts/clients/base/api/CustomFilterApi.php */

require_once 'clients/base/api/FilterApi.php';

class CustomFilterApi extends FilterApi
{
    public function registerApiRest()
    {
        return array(
            'filterModuleGet' => array(
                'reqType' => 'GET',
                'path' => array('<module>', 'filter'),
                'pathVars' => array('module', ''),
                'method' => 'filterList',
                'jsonParams' => array('filter'),
                'shortHelp' => 'Lists filtered records.',
                'longHelp' => 'include/api/help/module_filter_get_help.html',
                'exceptions' => array(
                    // Thrown in filterList
                    'SugarApiExceptionInvalidParameter',
                    // Thrown in filterListSetup and parseArguments
                    'SugarApiExceptionNotAuthorized',
                ),
            ),
        );
    }

    public function __construct()
    {
        global $current_user;
        self::$current_user = $current_user;
    }

    protected static function addOwnerFilter(
        SugarQuery $q,
        SugarQuery_Builder_Where $where,
        $link
    ) { 
        parent::addOwnerFilter($q, $where, $link);
        
        //Force a specific AND condition on the My Accounts default filter
        $where->equals('billing_address_city', 'Santa Fe');
    }
}