That type of contract can not be assigned by an obligated party to another without consent of the party owed that performance.

It's not that one gives consent, they may sign the sale agreement, could sign the deed, but what they may also be required, instead, is to sign a wavier of marital interests. :)   

once money goes in its there to stay without both parties consenting in writing.

Only the owner of a property can obtain a permit - which legally prevents tenants from placing a fire-pit on the property without your consent.  

FEESApplication Fee (to cover administrative costs)... common in most markets.Move-In Fee (to cover administrative costs)... common in some markets, but not seen in others.Pet Fee (for the privilege of keeping a pet)Guest Fee (a per diem fee for the privilege of allowing a guest to stay past the customary guest period)Notice Service Fee (cost of serving/posting/mailing legal notices related to rental agreement violations)NonSufficient Funds Fee (cost of trying to process an NSF check)Rent Late Fee (violation fee)Utilities Late Fee (violation fee)Unauthorized Pet Fee (violation fee)Unauthorized Occupant Fee (violation fee)Unauthorized Parking Fee (violation fee)Unauthorized Modification Fee (violation fee) - modifying the structure of the property without written consent, includes changing out light fixtures and plumbing fixtures.Unauthorized Installation Fee (violation fee) - includes installation of  telecommunications equipment on the property without written consent.Smoking Fee (violation fee)Smoke/CO Alarm Tampering Fee (violation fee)Fire Suppression Equipment Tampering Fee (violation fee)Door Lock/Window Lock Tampering Fee (violation fee)Garbage Fee (violation fee for cleaning up and disposing of excess garbage)HERE ARE SOME OTHER IDEAS:Property Damage - charge as it occurs or as it is discovered.Special Services - charge as they are provided.

You can place that provision in the contract for purchase and sale.For earnest money it is key that the language is written in a away that the EM - IS NOT interpleaded into a court of law if both parties cannot agree.If the buyer can demonstrate that the seller is in default or that the buyer has the right to cancel then the sellers consent will not be needed.It's important to have that in there because I have seen sellers or attorneys do a ransom where they say your 50,000 earnest money we will dispute and then title will have to interplead into court.

In some states it is illegal to record phone conversations with out both parties consent. 

Not everyone goes that route, it's how I started s well, so I'd say it works, but it's not easy.Joseph, stay away from land contracts an no, you can not assign any financing contract to some other buyer without the specific consent of that seller/lender.No, I didn't listen to Grant's podcast.

My reading of point #2 is that you could receive approval for your 4 unit condo project if you obtain consent/agreement for all the current owners in the subdivision (since I'm assume the original subdividers have passed on).I agree with @Alex G. that you would need unanimous agreement to have the restrictions completely removed. 

"(b) Due-on-sale clause means a contract provision which authorizes the lender, at its option, to declare immediately due and payable sums secured by the lender's security instrument upon a sale of transfer of all or any part of the real property securing the loan without the lender's prior written consent.