0000003499 2022-05-19 2022-05-19 0000003499 false --12-31 8-K 2022-05-19 ALEXANDERS INC DE 001-06064 51-0100517 210 Route 4 East Paramus, NJ 07652 201 587-8541 false false false false Common Stock, $1 par value per share ALX NYSE false