Thus, the subsequent sale was invalid and conveyed no title." 

@Douglas J Andrews, Nope, a land contract usually conveys enough of the burdens and benefits of ownership that the IRS would treat it as a sale. 

They have pre-purchased financing, and are conveying it, with added discounts given it's secured on there product and with assurances of such.

I bet you solve most of this by a quick boilerplate paragraph on the app about how you keep the data secureI wouldn't even do that, it conveys liability which most can't assure.

The provisions of RCW 65.08.070 [requiring conveyances of interest in rents to be recorded] as now or hereafter amended shall be applicable to such rents and profits, and such rents and profits are excluded from *Article 62A.9 RCW.

What IS a big deal is conveying trust, authority, likeability, AND segmenting "sellers" from motivated sellers.These 2 are a completely different audience. 

How do I convey this message to renters?

That was never my intention to convey that premise.

Pro Tip: Make sure the laundry vendor names the property as "co-insured" and does not simply provide a certificate of insurance for the property's file Since laundry leases are "real property" leases a separate paragraph will spell out that the laundry lease conveys when the land is sold.... so any property that is sold while the lease is in effect will be required by law to assume it. - this is often times confusing for a new or amateur owner who may not be schooled in real property leases.

The seller's agent contacted my buyer's representative late last night to verbally convey that our offer had been accepted.