In every step I must fully disclose what I am buying and selling, i.e. in this case an equitable interest (the right to acquire title upon specific performance under the terms of contract).

He cannot verify the income because he is most likely hiding something....so what else about the building is he not disclosing? 

If so, you need to disclose this when you make a post recommending or suggesting the product or service you represent or have a financial interest in.  

So if you are looking to get a conventional mortgage you will still need to disclose the debt. 

This is why disclosing the city is important.

All ownership information is public record on every site so the only reason you won't disclose it is because it will prove you are lying or really puffing in your post in order to try to get business.

Are they obligated to provide those or disclose that they did the work themselves?

Clients now only use what they need & not much more.We have it duly written into all of our Leases, so it's fully disclosed and we engage all prospective Tenants in an honest conversation about paying all of their bills before they move in. 

Similar to Realtor.com the leading real estate company Zillow announced it will disclose climate risk features such as: flood, fire, wind, heat and air quality risks.

They just have to disclose that they may or are doing a 1031 exchange as part of the sale, typically.