Thanks for the input, guys.
As for buying above appraised value, my understanding is that it's common for development land, since for a traditional bank mortgage they require the appraisal to be on the current value of the property, not its potential value after development (or so I was told by my mortgage broker). That's why I decided to go with a private loan — I probably wouldn't have been able to get a good LTV on a bank loan. (That said, the current cap with the rental income on the cottage is still around 5.7% — not too bad for this area!)
Does anyone have experience using subordinated and preferred debt? A commercial lender that will be making the construction loan just wants to be sure they are first in line if things go sideways — seems to me that making the construction loan the preferred loan and the land loan a subordinated loan would satisfy that requirement. Along the same lines, if the private loan were unsecured (not collateralized by the property at all), couldn't I still use the property as equity against the construction loan?
My thinking is to structure the private loan to have interest-only monthly payments at ~3.04% APR (the IRS AFR for mid-term loans) with a balloon payment of the principal at 9 years (the maximum length for mid-term loans, as defined by the IRS) and no pre-payment penalty.
Thoughts, suggestions, concerns? I'd appreciate any additional perspectives!