need help justifying comps

[Aaron Villarreal]

Guys, I need your help ASAP please. 

I have my subject property that is a pier and beam foundation followed by two comps that are SLAB foundation (I tried finding comps with only pier and beam- no luck). I have checked my subject property radius within a 0.5 mile radius following 24 MONTHS of last sold and NOTHING. (I always strive for last sold within 3-6 months. 1 year at MOST/WORST CASE) 

What would you guys do to justify my subject property to other comps? I don't want investors to blow me of or for me to lose creditability due to this small challenge. Thank you.