This is what I came up with for the land underneath both the Amtrak building and Sunset Station itself...
Owner Name: VIA METROPOLITAN TRANSIT
Doing Business As: Null
Property Identification Number:1057861
Geo Identification Number:14082-002-0048
Legal Description: NCB 14082 BLK 2 LOT 4 (EXCEPT S IRR 147.42 FT (.442 A), S IRR 96.39 FT (.236 A) & W IRR 312.5 FT (1.313 A)
State Code: C1
Address: 130 HOEFGEN AVE SAN ANTONIO, TX 78205
Taxing Jurisdictions: 09, 11, 57, CAD, 06, 10, SA011, 21, 08
Appraised Value: $6,430,710.00
Neighborhood: NBHD code11815
Abstract Code: S14082
For the parking areas immediately to the West of the Amtrak building...
Owner Name: SSG HOTEL LLC
Doing Business As: STAYBRIDGE HOTEL PARKING LOT
Property Identification Number:1057859
Geo Identification Number:14082-002-0046
Legal Description: NCB 14082 BLK 2 LOT S IRR 147.42 FT OF 4
State Code: F1
Address: HOEFGEN AVE SAN ANTONIO, TX 78205
Taxing Jurisdictions: 08, 09, 21, 57, CAD, 10, 11, SA011, 06
Appraised Value: $435,570.00
Neighborhood: NBHD code11815
Abstract Code: S14082
Owner Name: SSG HOTEL LLC
Doing Business As: STAYBRIDGE HOTEL PARKING LOT
Property Identification Number:1057860
Geo Identification Number:14082-002-0047
Legal Description: NCB 14082 BLK 2 LOT S IRR 96.39 FT OF 4
State Code: F1
Address: HOEFGEN AVE SAN ANTONIO, TX 78205
Taxing Jurisdictions: 11, 09, 57, 10, 06, CAD, SA011, 08, 21
Appraised Value: $253,770.00
Neighborhood: NBHD code11815
Abstract Code: S14082
Owner Name: EAST COMMERCE PARKING LLC
Doing Business As: Null
Property Identification Number:1087540
Geo Identification Number:14082-002-0049
Legal Description: NCB 14082 BLK 2 LOT W IRR 312.5 FT OF 4
State Code: F3
Address: HOEFGEN AVE SAN ANTONIO, TX 78205
Taxing Jurisdictions: 09, 21, 57, CAD, SA011, 06, 10, 08, 11
Appraised Value: $1,132,550.00
Neighborhood: NBHD code11815
Abstract Code: S14082
For the parking area to the East of the tracks...
Owner Name: CATERING BY ROSEMARY INC
Doing Business As: THE R.K. GROUP
Property Identification Number:106358
Geo Identification Number:00602-000-0220
Legal Description: NCB 602 BLK LOT 22
State Code: F1
Address: 1220 E COMMERCE ST SAN ANTONIO, TX 78205
Taxing Jurisdictions: 57, 09, SA011, 10, 08, 21, 06, 11, CAD
Appraised Value: $3,205,000.00
Neighborhood: NBHD code11815
Abstract Code: S00602
Hope that helps.