The buyer SHOULD have gotten inspections which would uncover dry rot by poking into exposed wood, other than smelling musty or seeing black or green scum on the walls a mold inspection is more detailed and samples go to a certified lab. 

Get a few samples and see which matches up.  

With the one I use this is what came back for the first 3 payments to just show you a sample of the amortization on a 10/20 loan:Payment DatePaymentPrincipalInterestTotal InterestBalanceAug 2021$1,663.79$913.79$750.00$750.00$299,086.21Sep 2021$1,663.79$916.08$747.72$1,497.72$298,170.13Oct 2021$1,663.79$918.37$745.43$2,243.14$297,251.76If you were wanting to max out the loan on day 1 and then pay it off in the first 10 years then your first 3 payments would look something like:Payment DatePaymentPrincipalInterestTotal InterestBalanceAug 2021$2,896.82$2,146.82$750.00$750.00$297,853.18Sep 2021$2,896.82$2,152.19$744.63$1,494.63$295,700.99Oct 2021$2,896.82$2,157.57$739.25$2,233.89$293,543.42Hope that helps

I would look up a sample operating agreement to review how you want to structure.  

We have identified a couple of homes that we would be interested in while Driving for Dollars and we have a name and address for the  current owner.  I'm hoping that some of you might share the letter and technique th...

Makes it difficult to get accurate value because of small sample size.Some infoLocation, affluent west shore suburb of Harrisburg, low crime,  family oriented neighborhoodRanch style, 2400 Square Feet total, everything updated by hvac system (works fine)Each unit has 2 bed 1.5 bath, one is 1400 sq other is 1000Rent is 1450 one side, 1500 the other, renters pay all utilitiesInsurance, maintenance, and yard upkeep total 3000 a yearGood renter clientele, most are doctors or nurses, close local hospitalsBoth have separate driveway and yard  Located in well of neighboorhood in low tax hampden township, taxes are 3500 a yearThe duplex was grandfathered, out of the 400+ houses in the  development, there are only 5 multifamilies. 4 houses down the street sold for between 380-400k in the last 4 months.

So buy a sample and test it out on a big patch of wall.  

If so, do you have a sample letter you could share?

Show a sample deal of what you invest in or have invested in and include information on why they should invest in you. 

@Caleb BrownThanks for your response and willingness to help out a newbie with some sample docs.