I'm not surprised his book of lies is tanking. Liberals don't read, and they're cheap as all get out. And I would expect Wilson to lie about his book sales.
As to Jacqueline C. Wilson--I don't know who she is. Seems I've heard it said Wilson married twice before marrying Valerie, but his bio only lists a wife named Susan Dale Otchis whom he divorced in 1986. Maybe someone can help out on this point.
If you search for 2700 Virginia Avenue NW Washington DC, you will find hits for the Watergate West apartment complex. I found several sales of apartments there. Can't say about rent, but about any house in the DC area would start at about $2,000/month and go up. I wouldn't be surprised to see rental in the Watergate in the several $K/month range.