On a couple of deals I've closed this year, my offers were I write the Sellers a check for a net amount and I pay all the closing costs, unpaid taxes, lawyers fees, title, etc.One property is a 10,000 s.f. commercial building that was listed at $90k and I originally offered $50k that was accepted.

Say if I were to win the auction and get an acceptance from the bank on my bid/offer, do I become responsible for it? 

These properties will require a group deciding if they will accept your offer or if they will have another sale with these properties. 

You may not "legally" need to take care of the water issue but you could end up in my situation.Tenant gets a mold test done and finds mold in the air. 

They are still getting back to me on what they would want, personally I don't care what they want for the property if it doesn't fit my threshold of an acceptable deal, 2. but realistically thinking of Cap rates and what could be done to increase the value of the property once bought.

As the strategist in putting together deals you must concern yourself with 1) end goals of all parties  2) experience and skill of all parties  3) the fears of all parties  4) the emotional condition of all parties 5) The risk acceptance of all parties 6) the comfort level of all parties and 6) your strength of relationship with all parties.

I tried to offer lower but seller wont accept it. http://www.zillow.com/homes/930-Saxon-Blvd-Deltona...Is the cash purchase price too much?

Cut out 75% of copy, eliminate all the "I" stuff.It's all about them, not about you.Then test. 

This strategy should also protect the downside a little better by offering a larger pool of buyers in the future.The way we try to claw back the cahsflow/equity is by targeting short sales or wholesale deals that may require rehab but are priced well below market value.We are not reinventing the wheel, simply implementing a tried and tested method.

Today I found that Colorado Springs Uitilies has test gardens..........soo zero scape but............ it gets better.