Purchase price, how many days out of the year it needs to be rented to break even, How much excess cash you will have on hand after purchase, etc.  

While many elements can contribute to the scale of a residential structure, designs should minimize the appearance of over or excessive building substantially in excess of existing structures in the neighborhood.

They are thinking; I don't need housing inspectors, lead paint suits, tenant's right in rent court, politicians against landlords, water bills in excess, squatters or law suits!

I’m in a high populated area, going further than a mile seemed to excessive

However, according to law, only non-profits can create pay-to-enter raffles, and the excess proceeds can only be used for the non-profit purpose.

I think that's what you'll need to get for proof of excess noise.

( That can include large unexpected repairs, for example, like finding out you’ll need a new HVAC system or a new roof, which can cost upwards of $500k plus).In addition, some of the investors who expressed an interest will end up backing out, and having an excess or reserve will help fill in the amount you lost.

A problem would be if she opposed it & refused to let you get started because she was too scared, or she wouldn't go for it because she has a spending problem and wants all excess cash for immediate consumption rather than investing. 

You take the 245,000 and pay off the old loan of 150,000. so 245,000 - 150,000 = 95,000.You take that excess 95,000 and put it towards your next down payment on a new property.And even with that new loan of 245,000 you still cash flow from the rents. 

Can this be rolled over for multiple years if the cost of rehab is in excess of the rent?