Can anyone point me towards an online calculator that will show how much sooner we would pay off our mortgage if we divided our monthly repayment amount by two and paid that amount (half of a monthly amount) every two weeks, instead of paying the monthly amount once a month?

Shows you can never trust ANYBODY! 

Listsource you can pay per lead or get a subscription. what are you using the data for and what lead types / properties are you looking for?

I will assume his loan and he pays me his mortgage, plus a little extra.

I want to buy the property on terms and demo, build a new house.I want to structure an owner finance deal with him where I either pay him interest only on the lot or no payments for 18 months (or until the new house completes and sells whichever is earlier). 

When buying an apartment building, it's reasonable for the buyer to ask the seller for copies of leases and proof that the rent is coming in, and the lender will likely ask for that same paperwork too (since that's what's paying the mortgage, not the buyer's personal W2 income, ha).

The thing is, she has until the 2nd of July to pay her back taxes, and if she is unable to pay by July 2nd, she will have to file for tax bankruptcy.

I have few properties in CA and I would like to set up a structure which provides me anonymity and reduced liability.I have set up a WY LLC and various real estate land trust where each trust will hold title to the individual real esate and the LLC will be beneficiary for all these trusts.

They will supposedly first pay you back your initial earnest money with interest within four weeks of signing their NEW RELEASE AGREEMENTS as a show of good faith if you get in touch with their attorney (send me a private message so I can send you instructions to get in contact with their attorney), and then the remaining outstanding deposit with interest within two months after that. 

She'd have to invest some money to create this set-up. 3) Selling doesn't make a lot of sense, because in this market, she'd end up paying the same for a small place, condo, with less flexibility.