Seller financial help

[Eric Hrlbock]

I put an offer of 50k owner financing for a condo. I currently have a comparable unit that appraised for 67k. I contacted owner 2 times and a follow up text. He called me last night offering to owner finance for 54 and hold loan for five year w 5k down and 935 a month. If my math is right that's 5.5 percent 

I am in contract for another condo through hubzu in same complex for 44. The hoa is 338 and taxes 253. I rent them for 1000-1100. Heat and hot water trash included.   

I am fairly green any advise or feedback is appreciated 

Eric