Heres the run down on it:
The Province has been looking for some new office space for a while, 3 or 4 years ago they submitted an application to build a ~40 floor office building to house consolidated employees, but eventually backed down presumably because the finances didn't match. So this tells us that they aren't just inventing a need for an office building to justify this.
Then, you get to the issue of MaRs. They have a brand spanking new office building literally across the street from Queens Park, sitting empty. They can't find the tenants, and have serious financial troubles. The province gave them a $234 million loan for it, hoping to encourage the expansion of MaRs which acts as a business incubator. It didn't work. Which gets us to our current situation.
The province can:
A) say "screw you", let MaRs file bankruptcy, and lose all money they are owed on their loan. The province still needs an office building, there is now an entire empty complex (not just a building, because remember, the entire MaRs organization went under) across the street which the province does not own, and the important function of MaRs in our economy is lost.
B) They purchase the building from MaRs, fixing their financial problems. (this creates the "bailout" situation) Thing is, its not like the province would then own an office building it doesn't know what to do with. You see, they have been looking for some new space for a while now. So in this situation, you get the office building the province was looking for at firesale prices (considering $234 million of the $317 million dollar purchase price is a loan they will default on unless you go through with the purchase), you save MaRs, and you no longer have an abandoned office complex across the street from Queens Park with the province shopping around for space.
Option B is the only rational choice, and because it is not your standard purchase, and because it involves spending money, the PCs are obviously against it. (A major feature of the PCs platforms is selling the provinces office buildings and renting them back to pay for transit, which obviously doesn't work as well as you would think it would as you have to start paying lease after the sale)