Attending council meetings to prolong the life of the contract was key.

Aside from avoiding the vacant house look due to no lighting, many municipalities require an inspection of the various utilities to reconnect after a prolonged period of no service. 

Leverage is great until you experience pro longed vacancy and lose all your propeties to the bank.

I’ve been building rapport with seller and seller agreed to sign the purchase sale agreement but has been prolonging like a week and a half .

You could prolong your financial suffering and continue to supplement his rent but your best option would be to go directly to $1550 and stop losing money.

I'm all about saving some money where I can, but I've heard that if something is wrong on the filing it may delay or prolong the process and getting in contact with the IRS or state reps can be difficult.My brother and I purchased a property 50/50.

In the end it just prolonged the inevitable.

My first questions to get answered are always:-  Do they have an existing mortgage or do they own the home free and clear (if a mortgage is present, do they need to pay it off for the deal to work)- Do they need the cash or do they want a prolonged income streamAnswers to those questions can help understand some of the key seller motivations.A typical seller financing structure would have a down-payment that would range from $10-$20K up to 10%-20%.Interest rates typically range 1-4pts over residential real estate mortgage interest ratesIf the seller wants long term cash-flow, the term can be 10yr-30yr.   

Could a market increasing 12% per year sustain prolonged growth?

No point in prolonging any interaction with her.