What you said is and still remains poor advice.

Details: I found a wrinkle in the local laws that allows one to build an addition to a SFR in such a way that the completed building remains classified as a SFR yet is easily rentable as a du-, tri- or fourplex and this does not violate any local landlord/tenant laws.I bought four SFR houses in my area for about 300k each.

and what about existing tenants with remaining leases and established rents?...

In a modification they take maybe 1/3 of the balance, put it on the side, use the remaining 2/3 at 2%, 30-40 year amortization, to come up with the greatly reduced payment.  

installation requires a permit, and permit requires an energy form calculated by the A/C company.if you just need either the inside or the outside unit replaced, make sure the old unit that remains uses the new R-410A freon (since 2010), not the older R-22.  

You would need to comp up with the remaining 20%, $19,000, from another source.Many HMLs charge up front points.  

With only a few weeks of listening remaining in my first pass through the Podcast Shows, I have begun to ask myself what I'll do with my time when I am finished?

Every agent should know that in a loan mod, a portion of the principal is temporarily "put on the side", usually about a third, for the sole purpose of calculating a new lower payment (ie 2% interest, 40 year amortization) on the remaining lower balance.  

Yes, and maybe...under these conditions:1 - The remaining cash flow meets your minimum cash flow per house (everyone is different here, and the market you are investing in plays a role.  

It will actually walk you through all kinds of scenarios you might encounter with notes such as balloons, paying partials, remaining balance on existing loans, calculating your roi, calculating offer price based on your roi etc.