>> no. >> reporter: were these buyers planning on living in these units, in these apartments? >> most of them, no. >> reporter: that never raised alarm bells with you? somebody buying 15 units, doesn't want to live in the place, from -- from russia? >> no. because that was normal. they had laundry money, that's their problem. >> reporter: and it wasn't just russians. one of the most famous money launderers in the world, davide guzman bought units in the building too. we met a former panamanian prosecutor who worked on the guzman case. [ speaking in foreign language ] >> translator: the guzman investigation was a vast case and as part of it we had information that alexandr ventura was the partner. >> reporter: we heard the same thing from freezener. >> guzman and ventura. >> reporter: was their relationship between both -- >> business partners. they became, after a couple years business partners. >> reporter: how did they work together? how did that collaboration work?