The seller decided not to sell.

... to take.Have a door in a run down condo in a good urban location that got an offer by an investor that now has overwheling majority of building owned. Was looking forward to rehabing the unit for cashflow or for ...

Hello Bigger Pockets,I have been  lurker on the board for months and finally decided to hop in on the fun. 

What factors do you look for most to decide what to offer?

It also requires significant marketing.Whether you decide to become a real estate investor yourself, or to find someone to lend/invest your money with, you will need significant knowledge of investing. 

Once you know what risks you face it becomes much easier to decide what levels of protection are appropriate for your situation.

Problem is, i don’t have the cash to do 20% and i really don’t like the idea of paying it for 30 years if I decide not to refinance.

If I were trying to decide this I'd figure the cost per unit to build each one and then look at the expected rent for each category and create a ratio. 

You must decide what your investing criteria is going to be and stick to it. 

I've been so nervous to get started for the last 10 years... yes 10 years :'( and have decided I'm done with the fear and get busy!