GTA IV Chrysler building

This download looks like an addon. You need to extract the downloaded zip and put the addon folder in your Garry's Mod addons folder. You should end up with a directory structure similar to below:

• steamapps
  • common
    • garrysmod
      • garrysmod
        • addons
          • Chrysler building <-- Addon folder!
            • e.g.
            • lua
            • maps
            • materials
            • models
            • etc

• Chrysler building/
  • info.txt
  • materials/
    • models/
      • chrysler/
        • dc_checkout_sgn_02.vmt
        • dc_checkout_sgn_02.vtf
        • mh_grey02.vmt
        • mh_grey02.vtf
        • ns_bank01.vmt
        • ns_bank01.vtf
        • ns_chrysler_door_lower.vmt
        • ns_chrysler_door_lower.vtf
        • ns_chrysler_door_upper.vmt
        • ns_chrysler_door_upper.vtf
        • ns_chrysler_spire.vmt
        • ns_chrysler_spire.vtf
        • ns_chrysler_window01.vmt
        • ns_chrysler_window01.vtf
        • ns_chrysler_window02.vmt
        • ns_chrysler_window02.vtf
        • ns_chrysler_window02_s.vmt
        • ns_chrysler_window02_s.vtf
        • ns_chrysler_window03.vmt
        • ns_chrysler_window03.vtf
        • ns_chrysler_window04.vmt
        • ns_chrysler_window04.vtf
        • ns_chrysler_window_upprgrnd.vmt
        • ns_chrysler_window_upprgrnd.vtf
        • ns_chrysler_window_upprgrnd02.vmt
        • ns_chrysler_window_upprgrnd02.vtf
        • ns_grocery01.vmt
        • ns_grocery01.vtf
        • ns_grocery02.vmt
        • ns_grocery02.vtf
        • ns_grocery_end.vmt
        • ns_grocery_end.vtf
        • ns_grocery_marb.vmt
        • ns_grocery_marb.vtf
        • ns_shoes_end.vmt
        • ns_shoes_end.vtf
        • swnjconc03.vmt
        • swnjconc03.vtf
        • ws_mh_commonroof4_big.vmt
        • ws_mh_commonroof4_big.vtf
  • models/
    • chrysler.dx80.vtx
    • chrysler.dx90.vtx
    • chrysler.mdl
    • chrysler.phy
    • chrysler.sw.vtx
    • chrysler.vvd

mehmetyalcn09, brunoxmansilla, WillemPlayz, Zac 64, sup ladies, alzajel2003, M2L-Lenny, kotutohum, lil.manmanjaymony, soloturkx00, HAK GG, menes6931, natan.miles2040, malikrasya026, samraquion, wolverine041269, cksoldier, stalkerjysus, adrianandujarrb, kgergo5800, raulenriqueriosmurillo, angedpro.r, kerjo9500, kristians.kormilovs, sadqpwra268, calvin4ya, Key-Drop.pl, [TM] Your Boy Jan, Wolf alphax, tatatanato, gabybarrocos, Mintburrito501, HACK MAN TF2, cstricata, Vandotr, crafter04, hont542, scandal, Le Menteur, sergiomagana2013, donna001, ghutubaba2, CroxGamer23, hasanbanz3, ghostiie, jaidongarner, renan3989, renan3989, Onurr, edgaralves2004 +419 others