Yet another parking question...

I'm moving to London in October with my roommate. Each of us has a vehicle, but hardly any 2 bedroom apartments in town include 2 parking spaces. One of the places we're looking at is super close to the 435 Clarence St lot, and I emailed the city asking about monthly parking permits and they said that the closest lots they had available for monthly passes was 199 Ridout and 695 Richmond, which are both over a 10 minute walk to this apartment.

The HONK app lists the lot at 533 Clarence on their list for permit parking, but when you click on it, it says that no monthly rates are available at that zone.

Is there a reason why permits can't be given to every public lot in the city??