I know that the general guidance is that emergency funds aren't to be invested, but given our financial security and the fact that we already have a personal e-fund in a safe, non-volatile location, would it still be crazy/unwise to invest this 15k in an S&P500 index fund in a brokerage? 

Where is the property located?

It's mostly Class A properties, a few Class B.You may find the below copy & paste info useful in addressing your question:----------------------------------------------------------------------------------Recommend you first figure out the property Class you want to invest in, THEN figure out the corresponding location to invest in.Property Class will typically dictate the Class of tenant you get, which greatly IMPACTS rental income stability and property maintenance/damage by tenants.If you apply Class A assumptions to a Class B or C purchase, your expectations won’t be met and it may be a financial disaster.If you buy/renovate a property in Class D area to Class A standards, what quality of tenant will you get?

In New Hampshire, title laws are strict, so we couldn’t move forward without obtaining a signature from a living heir.The title company dug deep and eventually located a distant relative—a niece of the deceased owner, two generations removed.

Tenant caulked the bathroom w/o any issues and did not hear from him for about 10 days.I get another call last night.

A 5000+ sqf Triplex located in the Tremont Area of Cleveland.

i also had HVAC mystery issues in my first duplex when we house hacked it.Regarding the Daikin Mini Split - I have one in the 3rd story of my current home and it seems to work great for us. 

Hello,I am a real estate investor located to Southeast MA, I own and manage a small portfolio of 23 units and am looking to expand and scale out of state as the returns and market have been quite difficult in my area: due to CAP Rates, specific building class I am looking to invest in, and rising interest rates/minimal inventory, as well as it would be nicer to be diversified and in a more landlord friendly state.  

Several factors indicate the company is not that concerned about efficiency or ease of customer process: the website, a process that seemed to focus on one issue at a time instead of all issues at once, and consistently poor communications and lack of common sense from the loan analyst we were assigned.It started off very well with the initial point of contact, Austin Lornson, who did a fine job of explaining the general refinancing process, responding quickly and thoroughly to our questions.

It would be wise to rectify it before transfer of title so your starting off clean and hopefully won't have any issues when you go to sell down the road.