House with foundation issues in central Texas

[Steve S.]

house built in 1984. Pretty decent overall metrics on my offer of about $139k which would rent for about $1,400

However, after inspection, it probably needs $3,000 of capex and with a foundation inspection it needs at least a soul leveling for $4,000 or a full foundation overall auk for $10,500

I countered during the option period with $125,000 to cover my capex coats. 

They countered with $132,000 and $1,250 towards my closing costs

Questions:

1) how long could input off the foundation repair?  If I delay will the expense go much higher?

2) given their offer would cover more than my capex costs if I just did the $4,000 soil leveling, what would your next steps on the negotiation be?

I'd expect to rent in November / December for around $1,400