You should have sufficient funds to cover vacancy, repairs, capital expenditures, etc.

I have a rental property with sufficient property gain about 1M, my wife like a bigger house, and I like a paid off, currently our primary house is not big enough, can I buy a house with 1031 property gain, leave vacant for couple months and then move in And then sell our current primary house to paid off kids school loan. 

Do you think this is sufficient or do you think it would be smarter to go with a replacement policy that costs about $200-300 more per year?

New condos may not have the sufficient amounts and if the construction was done poorly, there may be lawsuits, and no one wants to buy a property embroiled in a lawsuit.

Although the all cash side will put forward many reasons supporting their approach to investing the bottom line is that the vast majority have extremely low risk tolerance.

If the windows and outlets as listed on your plans do not comply with the building code, or don't have a sufficient level of detail, it makes sense that they are denying you.

For a number of my apartments, a full time minimum wage job would provide sufficient income to qualify.But the tenants described in the book, Evicted, were not tenants that would qualify for my apartments based on either income or eviction history.  

The vast majority of them in Las Vegas are overpriced pieces of crap.

I am not trying to displace a family in the dead of the winter and I would love to give them sufficient time to figure out other living arrangements.

NOTE: there is no hard and fast IRS rule about how long you need to hold a property for it to be considered long-term, but most folks agree 12-18 months is sufficient to satisfy the IRS that the property is an investment and not a flip (inventory).The opposite strategy involves converting a rental to a primary residence, so the process is essentially flipped in the beginning.