Для Александра

<?php

// Вариант 1
$realty_type = get_field_object( 'sas_realty_type' );

if ( $realty_type ) { ?>
    <div class="filter__item">
        <select name="<?php echo $realty_type['name']; ?>">
            <option selected="selected" disabled>Тип недвижимости</option>
            <?php
            foreach ( $realty_type['choices'] as $key => $value ):
              ?>
                <option value="<?php echo $key; ?>"><?php echo $value; ?></option>
              <?php
            endforeach;
            ?>
        </select>
    </div>
    <?php
}

// Вариант 2
$realty_type = get_field_object( 'sas_realty_type' );

if ( $realty_type ) {
    $options = '<option selected="selected" disabled>Тип недвижимости</option>';

    foreach ( $realty_type['choices'] as $key => $value ) {
        $options .= sprintf( '<option value="%s">%s</option>', $key, $value );
    }

    $select = sprintf( '<select name="%s">%s</select>', $realty_type['name'], $options );

    printf( '<div class="filter__item">%s</div>', $select );
}