It sounds and looks like the wax seal has failed. The good news is this repair is not hard. The bad news it is a "dirty job" .
Step 1 get a new wax seal at a plumbing or big box store just a couple of bucks. I like the ones with a urathane center they are a bit more expensive but 5 bucks is not a big deal. Also pick up some disposable gloves and a narrow putty knife (makes removing the old wax easier)
Step 2 turn the water to the toilet off and flush you want to empty the tank. If you have a wet vacuum suck the small amount left in the tank out and also drain the bowl, if no wet vacuum a small towel can be used to soak up the water and squeeze out down another drain.
Step 3 remove the supply line to the toilet.
Step 4 remove the 2 bolts at the floor, 1 on each side.
Step 5 lift the entire unit by the base not the tankand lay on its side.
Step 6 clean the old wax seal off the bottom of The stool and the top of the toilet flange (the plumbing at floor level). Make sure to remove the rubber cone.
Step 7 take new seal and mold it to the bottom of the stool.
Step 8 this is the toughest part, pick up the stool by the base and position it over the bolts and lower it then press down, once the bolts are through I usually sit on it to help squash the seal a bit.
Step 9 install the washers and nuts tighten both sides a few turns each until snug, sit on the stool and see if it is loose if it is tighten a little more and check again (a stool that wobbles will shorten the seal life).
Step 10 replace the water line and turn on.
Once the tank fills flush and verify everything is working with no leaks.
Now just to clean up and dispose of the old wax ring & gloves and realize you just saved a bunch of $.
You can custom make a shower bed to utilize your drain location Or possibly find one Off the shelf, you can a standard drain or a trough drain. i have seen drains in many locations of all types and have never heard of a code specific to its location.
There is a code concerning the distance of the drain from the vent, so if you do move the drain you will need to know that code distance and where your vent is.
( I AM NOT AN EXPERT, I JUST PLAY ONE ON STACK EXCHANGE )
If you don't have access to underneath the floor you will not be able to move it unless you plan on putting in step up shower bed. It appears you can cut the flooring within the wood framing to access the connection of the brass to he main drain. You will need to see how the brass is attached to the trap in order to know how to go about disconnecting it. i can not tell what the rest of your flour is made of nor do i know the regulations of your condo.
Let us know once you have done some exploratory surgery on your floor.
Best Answer
I use dry ice on metal plumbing when the service valve is not functional or not in the area. Grocery stores have had dry ice in several states I have lived some times you have to ask and it is sold by the pound. I use a hammer and screwdriver to break some chunks off and a cloth to hold the dry ice in place. I pack around the pipe for 1-2” and hold it in place for a few minutes then cut the pipe. Or in your case remove the shark bite. The dry ice may last up to an hour depending on how tight you pack it around the pipe and how thick. I have used this method for years with great results much cheaper and faster than a commercial unit to freeze the pipe.
Caution instant frostbite if you touch the dry ice. I use heavy welding gloves but any well insulated gloves will probably work.
The “smoke” coming off dry ice is just carbon dioxide (the fizz in soda is carbon dioxide) it’s non toxic but fresh air is needed, just keep the door open if it’s in a small closet.
Last the left over dry ice can be fun at home wrap in newspapers to help it last longer and put in a cooler, you can put it in water and it makes a neat smoke again non toxic, I have used chunks like ice cubes in punch bowls for a special brew of Hawaiian Punch the kids love because of the smoke.
I am sure there are other instructions using dry ice on line with photos but I have done this for almost 50 years and never broken a metal pipe it works best on copper.