Looks like a Water Sourced Heat Pump. I’m not familiar with Skymarks Chassis type WSHP units but I am familiar with the Whalen that are much more common in my area.
If the compressor is turning off before it’s set temperature is reached then it could be locking itself out on high pressure, low pressure, internal compressor safety, or condensate overflow safety. I’m not sure if your unit will have all those safeties though so some may not apply in your instance.
Are other people in the building having issues? If they are then I would contact the strata company and alert them that there may be a cooling tower issue or loop issue. They will also know who services the buildings common area equipment (boilers, domestic hot water, tower, electrical vault AC, sump pumps, etc) those are the people that would best be suited to service your heat pump. Because they know the building and probably have a set of building keys at their office they will be able to better troubleshoot your unit. For instance, some buildings operate a heating season and a cooling season and those buildings tennents will not ba able to operate their cooling without issues resulting unless the building has switched over to its cooling season. If your building is controlled by DDC then they will most likely have access to the interface in the event that they need to view parameters.
As a general rule of thumb, a typical residential technician or company like Sears would not be familiar enough with your unit for them to properly work on it. You will either need to find a company that services commercial equipment or best option is to use the buildings current service provider. A commercial company’s hourly rate is often higher but their techs should be properly trained on that equipment and familiar with towers and how they operate.
It’s hard to narrow down exactly where your issue is, if it’s a loop issue then the rest of the building will probably also have mentioned it to the concierge and he would be aware of it by now. If it’s a plugged condensate drain, low pressure or high pressure safety then it could show signs like you describe (depending on how the units logic is programmed to operate).
Before you call a tech you will want to see if the condensate drain line is clear and free, check that you have a clean filter installed, check that your supply and return water lines to the heat pump unit are open, contact the concierge or strata manager to see if this is a global building issue. After checking those items then it is time to call a technician to continue troubleshooting from on site. It’s hard to diagnose a failed capacitor, dirty condenser, or other cause of issue without getting a trained set of hands on it unfortunately.