they just recently added some more of these alt floors within sync.bin
the alt floors are used when a specific uniform id is used, it is contained within the stadium data.
Each can have up to three alt floors and there is 3 possible uniform id numbers to use for those alt floors
Example 1
Example 2
These are the ones currently assigned within the sync.bin default roster
f000_alt
f000_alt2 #828=u000phi_current_city
f001_alt
f001_alt2 #84=u001mil_current_secondary
f004_alt #803=u004cle_current_city
f010_alt #807=u010mia_current_city
f012_alt #809=u012uta_current_city
f013_alt #212=u013sac_current_secondary
f019_alt #312=u019den_current_secondary
f019_alt2 #815=u019den_current_city
f022_alt #819=u022tor_current_city
f029_alt
f029_alt2 #454=u029gs_current_secondary
f031_alt #788=u031cha_current_hwc
a lot of these have been messed with or added from sync.bin so basically not much you can do with them if they were introduced to the game from sync.bin
if they were already there to begin with you would have to mess with the updated sync.bin file so that the modded file shows instead
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