private BigDecimal getAreaNotInRentNew(ContractPosition position, Date period) {
    try{
        Calendar cal = Calendar.getInstance();
        cal.setTime(period);

        cal.set(Calendar.DAY_OF_MONTH, cal.getActualMinimum(Calendar.DAY_OF_MONTH));
        Date from = cal.getTime();

        cal.set(Calendar.DAY_OF_MONTH, cal.getActualMaximum(Calendar.DAY_OF_MONTH));
        Date to = cal.getTime();

        BigDecimal sum = dataManager.loadValue("select max(r.contragentRealEstate.calculationAmount) - sum(r.areaInRent) from rtneo$RealEstateRenter r where " +
                "r.contragentRealEstate.id = :id " +
                "and (r.renterRecord.validityFrom <= :from " +
                "and r.renterRecord.validityTo >= :to)", BigDecimal.class)
                .parameter("id", position.getContragentRealEstate().getId())
                .parameter("from", from)
                .parameter("to", to)
                .one();
        return sum;
    } catch (NullPointerException e) {
        return BigDecimal.ZERO;
    }
}