Exposing a 220v socket in my condo
Power service to your building includes a 3-phase, 208-volt, wye (or star) distribution system. That provides 208 volts between any two of three phase terminals and 120 volts between any phase terminal and the neutral terminal. Any one condo in the building would be served by two phase conductors and a neutral conductor plus a protective earth (ground) conductor that is connected to neutral at the service entrance. This system is used in some commercial and multi-unit buildings in the US, but it is somewhat uncommon.

If you have loads that rated to operate on 208 V, 60 Hz, it makes sense to install 208-volt receptacles for those loads if it is not too expensive. The equipment should be marked with a voltage range and frequency. If is says something like 200-240V, 50/60 Hz or 47-63 Hz, the equipment is ok for 208V, 60Hz. You can probably not use any existing wiring, because it is likely protected by larger circuit breakers than would be permissible for lower current receptacles and loads. In addition, the existing circuits are intended to serve certain loads. An electrician can tell you what is involved and the cost of the wiring. In addition to that cost, there may be repair of plaster and painting required for any openings made by the electrician. An electrician would not usually do that repair.

Read you condo association documents, wiring may be owned in common, not owned by the unit owner. Your individual ownership may be only the paint on the walls inward. In addition, any wiring must conform to the local electrical code and all receptacles are more than likely required to conform to Underwriters Laboratory (UL) standards. Code may not allow a schuko receptacle.