You can use multiple letters as long they add up to the amount needed and make it clear that you're going to combine them to pay for the property.

We financed with a combination of the remaining line of credit and a low interest credit card.

well, it sounds like you have thought things thru for the most part. but to combine heat and hot water will require you to have a boiler system, and those can be expensive. even thousands of dollars more than a conventional forced air furnace. that $600 a month is nice, but how long is it going to take to recoup your costs of installing boilers and water heaters in all of your units???

And if you pre commercial thin you can create the necessary ring counts and knots to jump into an export grade log which will bring 20 to 40% or more in value than a domestic log.So if you combine this with the same buying principals that most of us RE folks look for IE a deal day one..

In my past life I was a public safety officer (combined police and fire) for a city department in California. 

You have to have extra cash available so when a hot water heater goes out or the air conditioning just shot craps or...

In some areas the showing apps are used a lot, in other places you just may get a combination code to the lockbox or a special card that is part of your membership to  NAR (the national association of realtors).

Its a crap shoot. 

We have considerable working income for our age (170k a yr combined so far) so we figure in 5 years we should be able to complete this 3 times over while still being able to cover expenses god forbid there is a lapse in rent.  

Account Closed (unless it is to ask for my number) - he'll just confuse the crap out of you :)