first you need to to open the sigil and meditate on it,koetting explains it greatly
now you did open his sigil
offer him smothing for exchange like incense or something sweet or even a drink like wine etc…
state state your request tell him that you need help with tell him what you want to happen when you finish simply forget the ritual,and thank belial
I am not so sure of how much into magick or meditation you are at the moment. but belial helped me in a similar situation where I owed $30,000 to a friend who ended up getting very pissed off with me. I requested Belial to make his life so incredibly busy that he wouldnt even have time to think about me. It worked like a charm and he disappeared for a year. By that time I was able to give him 23k of the 30k and everything was fine. Now I have been able to take care of him fully. that is one option.
Another option would be to call upoj the power of the earth gnomes, request them to find you a buyer of the property asap.
Best thing you can do is both of the above for 2 time advantages