. $15,000 roof) and two of the partners don't have the funds available to contribute their share?

The only time I think it makes sense to have the seller make repairs is when the lack of repairs could cause more problems with the home by the time you close on the property (such as leaking roof, heat before winter time). 

We fix the buildings up and get them full of tenants but my latest purchase he said they likely wouldn't be able to do because of the roof is older then 20 years and its 40% vacant. 

Renovations include new roof, plumbing, windows, electrical and HVAC.

He also mentioned that the HOA changed the roof 6 yrs ago. 

If there is a storm, they also have a person to go up the roof to check the shingles.I guess for me, I'm wondering what is 'appropriate' in terms of involvement and making sure the house is still in good condition, inside and out.

Roof is leaking inside.  

Renovations include new roof, plumbing, windows, electrical and HVAC.

Do you save three months of vacancy for each unit and $50,000 for the roof replacement?

I used eastside lending for the hard money and a mortgage broker other than that I did everything else personally and looking back I wish I would have had more people to talk to about this so it was no nerve racking.