Buying a 60 boost for MCH does not count as having a class at 50 for buying apartment

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Time: 10:51 pm
Frequency: every attempt
World name: Balmung
Character name: Warm Blanky
Retainer name: Clawdia
NPC name: Apartment Caretaker
Class/Level: MCH 67
Party or solo: Solo
In-game time: 5 days, 21 hours, 25 minutes
Area and coordinates: Apartments
Housing: Apartments
Steps:
1. buy 60 boost for mch
2. open dialogue to purchase apartment
3. be told you must be level 50 in a class to purchase apartment

Do you also have your GC rank up?

Yeah. You need to be second lieutenant woth one of the grand companies as well.