The builder dried with fans and made sure there was no moisture.

Most 2nd position lenders will want the investor to have skin in the game (invest their own money) AND be paid a double-digit return.When you purchase property, you ALWAYS need to have reserves, but in this scenario, you really need to have reserves since you will need to make 2 large debt payments every month.

Commercial require you to have at least 20% skin in the game correct?

-Has no crawlspace (common for older properties) so we couldn't see the foundation-Drywood termite/wood decaying fungi damage seen on all the windows/doors/parts of the beam on the exterior, parts of roof decking and rafters in the attic-Old leaks/moisture damage seen in the ceilings and attic-Parts of the roof has patch work-Roof doesn't have any permits on record (don't know how old it is)Seller's offer to me:-Fumigation treatment for drywood termites (tenting the house)-Replace and repair all damage wood throughout the house-Replace the entire roof with a new permit-Replace one window in every room (not all)-Pay for a structural engineer to inspect the foundation-Offer to get quotes for repairs and have a 15-20K budget to make all repairs, house is 500K.

LOTS of people in beach markets like mine report the Schlage Encode has issues with the humidity/moisture. 

For instance, if I manage to raise private capital to fund a deal and purchase a successful rental property, how would this actually benefit ME when I have no skin in the game (i.e. money of my own invested)?

Others may have a different opinion, but outside of a seller carry back up to 90% CLTV (still require some skin in the game, unless you go true hard money) 2nd liens on real estate for purchase transactions in the manner you're seeking are very difficult to get a loan against, whether it be a secondary market lender (private equity fund, balance sheet lender, family office, etc), and usually are seeking larger transcations ($1-3MM +) in this space, and are still capped at a max 75-80% CLTV (still wanting skin in the game).# 4 usually requires more explanation as its newer to the market (DM me if interested in discussing these options further), but all 1-4 appear to be potential options for you based on the limited details. 

Sometimes moisture gets under the tile and they lift.

@Henry HsiehTo provide a different perspective:I am NOT a property manager so I have no skin in this game  But I can tell you, as a GP involved with over 1100 units and $140M AUM, good property management is a big key to successful investment. 

The one I am most concerned with is the moisture stain, were they able to figure out where that is coming from?