For example, if a building is consistently turning every 12 months, that usually means either pricing or maintenance expectations are off.

Although it is usually to the investor's benefit to do a cost segregation study the first year of owership, properties that have been owned for longer than one year can also take advantage of the tax benefits and cash flow available with cost segregation.The amount of depreciation can vary between 25% to 50% of what you paid for the property mimus land with the 100% Bonus Depreciation. 

Rates are usually dictated by competition, bond market activity, and investor buyer pool.

Or do you usually only get that info once you’re in contract or during due diligence? 

In our case, what we usually do is ask them to send us a formal signed letter explaining the specific reason why they need to pay their rent in two installments (usually because of how they get paid at work).We also ask for their permission and the contact number of their employer to verify the information.

I’d start by reaching out to local portfolio lenders (credit unions are great for this) or a broker (me) who does investor loans – they usually have products designed exactly for this situation and do a 2nd position that'll allow you to tap into the equity without touching your 1st. 

That’s not usually when sellers are in the best mood. :-).

Mine usually don’t produce much at all the first 2 or 3 years.

Foreclosure sales can be a "tricky wicket" if you aren't careful.The opening bid is usually the amount the lender is owed, plus foreclosure fees. 

I don't know how long you've been in the industry, but if it sounds too good to be true, it usually is, especially when there is so much scam stuff happening in the hard/private money side of things still.