Banks and anyone with liens on his property is going to take priority over unsecured debt.

For example, are you ok with your investment being unsecured for 6.5-8% where you can get a guaranteed return from the Fed for almost 5%?

You can just write a check from your secured business line.The goal here is to build your LLC's business credit so that eventually, you can open an unsecured business line for $40K or more.Your $15K will not really earn money doing it this way.

Your state may have strict requirements making it fraud there; however, it is perfectly acceptable and often times viewed more favorably than an unsecured loan for the very fact that the loan is secured by collateral.

If you find one or get approved for an unsecured BLOC, please do share.  

Just leave a note saying you entered to fix or service what was needed..if they won't let you in I guess you call water dept and have water shut off at the curb if it's water related.. call gas and have gas shut off at outside of bldg if it's gas related, notify police your building is unsecured and you have attempted to secure but have been barred access and need escort.. and you file eviction emergency action for cause I always have phone camera ready..the he said , she said on this will be a ongoing situation.. get them both out.. mutual lease termination if possible.. just document noise infractions,, and damages,, police calls are not infraction if they call themselves.. if neighbor call police get copy of report.. if you call its a unsubstantiated report/ shows bias and cant' be used as reason for eviction. better if tenant or neighbor calls.One way or the other they will get out.. damages will happen and better to safe guard yourself then to get between 2 crazy people.. the cops out there will tell you the most violent unpredictable calls are domestics.. and people get hurt, killed,, don't let it be you. 

There were missing junction boxes, some really old wiring that we don't know if it's live or not but really ought to get replaced (knob and tube), no ground, unsecured splices, and no master switch at the panel.

We have a HELOC and an Expressline unsecured line through Umpqua and couldn't be happier with the process.Also, just spitballing here, but can you also open business lines at places like Home Depot or Office Depot?  

My 10% guy is unsecured, so it's more like a small business loan and I'm aware that I won't be able to replicate that very easily

Not any longer.FYI, HELOCs are better than Unsecured revolving debt such as credit card cash advances, when considering where funds come from, for use as down payment funds on new mortgages.