There are limits on what each can do without the consent of the other.

Another item is confirmation from the first position lender they will allow registration of a subordinate lien/mortgage {with many residential bank mortgages here, registering a second, especially w/o their consent, could enable them to call the first}.

If the lease requires the owners consent it would appear you have no grounds.

Im not against options, just be careful, the reality is very few people exercise their option, like 2-5% (they just cant clean up their credit and save) and tend to forfeit their option money, even though you have a contract, do this a few times, and you will build a reputation, and not a good one even though what you are doing is legal, and everyone consented you will still be considered the bad guy for taking their option money.

(BTW, you can't wholesale a financed sale or Sub-2 without the seller's specific consent accepting the real buyer.)  ?

We also assess a late payment fee and report a non-payment of rent to the credit bureau {all our tenants consent to reporting when the sign the lease}.

Tenant agrees not to sublet said premises, nor assign this agreement,nor any part thereof without prior written consent of Landlord.OCCUPANCY. 

I agree they should not have touched the plumbing without written consent from you.

A judicial foreclosure in those Canadian provinces which use it, the lender must file a Statement of Claim before the Court of Queen's Bench to obtain consent to proceed with the foreclosure.  

This would of course require the consent and willingness of all parties involved in the contract.