@Pouya Banki difficult to say what's "standard" without considering PM compensation.

You may have to pay the agent's commission as many of these properties only compensate the seller's agent - in other words "each side pays it's own way." 

Without getting into the whole ugly conversation, you are also paying that PM more than you think you are as they are compensated on these repair costs.  

So if a PM is used then cash flow is $195/month not including principle pay down and I would not suggest this is a good compensation but with principle pay down it is $695/month which is not bad.  

And they’ve lowered your rent to compensate for all of their fees.  

Increased risk typically results in increased return (higher rent) to compensate for the increased risk 2) I have a lot of confidence long term (over 10 years) San Diego RE prices will go up faster than inflation. 

I have enough capital for the down payment, closing costs, renos, etc. and will be handling everything else as well (finding/screening tenants, management, etc.) so essentially all I need is someone to cosign on the mortgage.My question is: what is a reasonable/fair compensation to offer the cosigner?

Compensation to the agent also is not an issue regardless of the limits of their responsibilities.

In my opinion, the banking industry is still over-compensating for being "spanked" after the whole debacle that occurred a few years ago.

I will want compensation for that in the lawsuit against the LL.My question is still the same though.