Sun is about to make the trine to Saturn in your 6th house, Saturn is real estate, dignified in Aquarius, albeit retrograde, could mean there is a something going on behind the scenes not readily revealed as you mentioned you are in the dark about the circumstances surrounding the final sale. You are the Sun-identifying with the hopes of obtaining the house by the trine effect Sun will experience with Saturn. Lucky strike N.N. is about to make contact with the Sun, some good comes your way from this position. Mars is exalted in Capricorn where 'changes' Pluto reside, as ruler of your 4th house of concluding energies-there is a type of mutual reception by opposition between the two of them, and Mars joys within the 6th house in Pluto's place. Maybe there will be some type of adjustment and agreement the prospective owners will experience to separate themselves from buying the house.
It doesn't hurt to inquire about the progress of the sale of the house. I don't like the last aspect the Moon makes to oppose Venus and Mercury, Mercury rules your house of money matters and the hopes and wishes, goals 11th house for you-energies that have a lot to say about what is coming up for you in the near future , 2nd house rules the future estate of situations rising for you.
I hope you are not let down by what the answer is concerning the house, it could be the money matters make it difficult to counter the bid the other tentative owners will make against yours?
Hope you will be able to buy the home of your dreams
StarDust1