<?xml version="1.0" encoding="UTF-8"?>

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2026 Workiva-->
<!--r:019e08a9-c929-72af-ab4a-670adcf8f0ef,g:d4626e95-107d-453a-83d0-f32111fd9313-->
<link:linkbase xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
  <link:roleRef roleURI="http://www.alx-inc.com/role/DocumentandEntityInformation" xlink:type="simple" xlink:href="alx-20260521.xsd#DocumentandEntityInformation"/>
  <link:presentationLink xlink:role="http://www.alx-inc.com/role/DocumentandEntityInformation" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_dei_CoverAbstract_019e08a9-c929-7b0f-aa8b-e9886ec425a5" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_CoverAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentType_019e08a9-c929-77d0-83b7-7848450b1723" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentType"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019e08a9-c929-7b0f-aa8b-e9886ec425a5" xlink:to="loc_dei_DocumentType_019e08a9-c929-77d0-83b7-7848450b1723" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentPeriodEndDate_019e08a9-c929-7cc4-9f85-63d05b186140" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentPeriodEndDate"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019e08a9-c929-7b0f-aa8b-e9886ec425a5" xlink:to="loc_dei_DocumentPeriodEndDate_019e08a9-c929-7cc4-9f85-63d05b186140" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityRegistrantName_019e08a9-c929-7a75-8505-4fb45147b218" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityRegistrantName"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019e08a9-c929-7b0f-aa8b-e9886ec425a5" xlink:to="loc_dei_EntityRegistrantName_019e08a9-c929-7a75-8505-4fb45147b218" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityIncorporationStateCountryCode_019e08a9-c929-75c7-973b-29cfe02976a4" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityIncorporationStateCountryCode"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019e08a9-c929-7b0f-aa8b-e9886ec425a5" xlink:to="loc_dei_EntityIncorporationStateCountryCode_019e08a9-c929-75c7-973b-29cfe02976a4" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityFileNumber_019e08a9-c929-704d-ae6c-08a94d0ac25c" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityFileNumber"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019e08a9-c929-7b0f-aa8b-e9886ec425a5" xlink:to="loc_dei_EntityFileNumber_019e08a9-c929-704d-ae6c-08a94d0ac25c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityTaxIdentificationNumber_019e08a9-c929-77a7-b0a9-95b9e39b7dc5" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityTaxIdentificationNumber"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019e08a9-c929-7b0f-aa8b-e9886ec425a5" xlink:to="loc_dei_EntityTaxIdentificationNumber_019e08a9-c929-77a7-b0a9-95b9e39b7dc5" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressAddressLine1_019e08a9-c929-795d-a8a4-fdd8c43af33e" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityAddressAddressLine1"/>
    <link:presentationArc order="7" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019e08a9-c929-7b0f-aa8b-e9886ec425a5" xlink:to="loc_dei_EntityAddressAddressLine1_019e08a9-c929-795d-a8a4-fdd8c43af33e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressCityOrTown_019e08a9-c929-77b4-983a-fe79ace42f0e" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityAddressCityOrTown"/>
    <link:presentationArc order="8" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019e08a9-c929-7b0f-aa8b-e9886ec425a5" xlink:to="loc_dei_EntityAddressCityOrTown_019e08a9-c929-77b4-983a-fe79ace42f0e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressStateOrProvince_019e08a9-c929-721b-9922-9d175b3c120a" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityAddressStateOrProvince"/>
    <link:presentationArc order="9" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019e08a9-c929-7b0f-aa8b-e9886ec425a5" xlink:to="loc_dei_EntityAddressStateOrProvince_019e08a9-c929-721b-9922-9d175b3c120a" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressPostalZipCode_019e08a9-c929-75d7-869f-293211453023" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityAddressPostalZipCode"/>
    <link:presentationArc order="10" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019e08a9-c929-7b0f-aa8b-e9886ec425a5" xlink:to="loc_dei_EntityAddressPostalZipCode_019e08a9-c929-75d7-869f-293211453023" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_CityAreaCode_019e08a9-c929-7660-bf8c-a1707fbff49f" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_CityAreaCode"/>
    <link:presentationArc order="11" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019e08a9-c929-7b0f-aa8b-e9886ec425a5" xlink:to="loc_dei_CityAreaCode_019e08a9-c929-7660-bf8c-a1707fbff49f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LocalPhoneNumber_019e08a9-c929-7f96-b057-408ff2749826" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LocalPhoneNumber"/>
    <link:presentationArc order="12" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019e08a9-c929-7b0f-aa8b-e9886ec425a5" xlink:to="loc_dei_LocalPhoneNumber_019e08a9-c929-7f96-b057-408ff2749826" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_Security12bTitle_019e08a9-c929-72e4-8b99-0442361766b8" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_Security12bTitle"/>
    <link:presentationArc order="13" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019e08a9-c929-7b0f-aa8b-e9886ec425a5" xlink:to="loc_dei_Security12bTitle_019e08a9-c929-72e4-8b99-0442361766b8" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_TradingSymbol_019e08a9-c929-7e72-a7e5-7fc3ab5d077a" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_TradingSymbol"/>
    <link:presentationArc order="14" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019e08a9-c929-7b0f-aa8b-e9886ec425a5" xlink:to="loc_dei_TradingSymbol_019e08a9-c929-7e72-a7e5-7fc3ab5d077a" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_SecurityExchangeName_019e08a9-c929-7a59-bed6-2f8f69693d3c" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_SecurityExchangeName"/>
    <link:presentationArc order="15" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019e08a9-c929-7b0f-aa8b-e9886ec425a5" xlink:to="loc_dei_SecurityExchangeName_019e08a9-c929-7a59-bed6-2f8f69693d3c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_WrittenCommunications_019e08a9-c929-7abf-8ba7-b264aa00cd78" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_WrittenCommunications"/>
    <link:presentationArc order="16" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019e08a9-c929-7b0f-aa8b-e9886ec425a5" xlink:to="loc_dei_WrittenCommunications_019e08a9-c929-7abf-8ba7-b264aa00cd78" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_SolicitingMaterial_019e08a9-c929-7b54-9a5e-893ece780b51" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_SolicitingMaterial"/>
    <link:presentationArc order="17" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019e08a9-c929-7b0f-aa8b-e9886ec425a5" xlink:to="loc_dei_SolicitingMaterial_019e08a9-c929-7b54-9a5e-893ece780b51" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_PreCommencementTenderOffer_019e08a9-c929-7e57-835e-3582b616870d" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_PreCommencementTenderOffer"/>
    <link:presentationArc order="18" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019e08a9-c929-7b0f-aa8b-e9886ec425a5" xlink:to="loc_dei_PreCommencementTenderOffer_019e08a9-c929-7e57-835e-3582b616870d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_PreCommencementIssuerTenderOffer_019e08a9-c929-7be0-aa7b-ef4debddfb7b" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_PreCommencementIssuerTenderOffer"/>
    <link:presentationArc order="19" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019e08a9-c929-7b0f-aa8b-e9886ec425a5" xlink:to="loc_dei_PreCommencementIssuerTenderOffer_019e08a9-c929-7be0-aa7b-ef4debddfb7b" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityEmergingGrowthCompany_019e08a9-c929-7b0c-bc3a-819f4fc94808" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityEmergingGrowthCompany"/>
    <link:presentationArc order="20" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019e08a9-c929-7b0f-aa8b-e9886ec425a5" xlink:to="loc_dei_EntityEmergingGrowthCompany_019e08a9-c929-7b0c-bc3a-819f4fc94808" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCentralIndexKey_019e08a9-c929-7ea8-a8ac-70d3abf29349" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityCentralIndexKey"/>
    <link:presentationArc order="21" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019e08a9-c929-7b0f-aa8b-e9886ec425a5" xlink:to="loc_dei_EntityCentralIndexKey_019e08a9-c929-7ea8-a8ac-70d3abf29349" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_AmendmentFlag_019e08a9-c929-72af-bf70-5a489cabaca7" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_AmendmentFlag"/>
    <link:presentationArc order="22" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019e08a9-c929-7b0f-aa8b-e9886ec425a5" xlink:to="loc_dei_AmendmentFlag_019e08a9-c929-72af-bf70-5a489cabaca7" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
</link:linkbase>
