Reading from Excel

return
    from record in numbers
    .Zip(cadastralCosts, (number, cost) => new { Number = number, Cost = cost })
    .Zip(specificCadastralCosts, (pair, spetialCost) => new { pair.Number, pair.Cost, SpecificCost = spetialCost })

    where record.Cost.IsDouble() && record.SpecificCost.IsDouble()

    let cadastralNumber = new CadastralNumber(record.Number.AsString())
    let cadastralCost = record.Cost.AsOptionDouble().GetValueOrDefault()
    let cadastralSpecificCost = record.SpecificCost.AsOptionDouble().GetValueOrDefault()

    select new RealEstate
    {
        CadastralNumber = cadastralNumber,
        CadastralCost = cadastralCost,
        CadastralCostUnit = _costUnit,
        SpecificCadastralCost = cadastralSpecificCost,
        SpecificCadastralCostUnit = _specificCostUnit
    };