There are alternatives and you can message me for some additional information. 

Yes, we’ve been contemplating the pure sell option.The alternative we’ve been discussions is to rent this out short term (1-2 years) while we purchase another 1-2 properties in the area as we potentially move into the original propertyYou’re absolutely right that we should leave emotions out of it, I just fear the future cost of acquisition will go up as neither my wife nor I are big into flipping

The same market conditions that affect large apartment complex vacancies will generally also affect 4-plex vacancies in a down market.Advantages of having a fourplex is limiting downside risk and having peace of mind by locking 30-year rates (as some people have mentioned). 2-4 unit buildings also allow cash constrained investors to get in on the RE game, particularly with techniques like house hacking. 

Sit down with your better half and figure out risk tolerances, etc. and career alternatives.

Alternatively look for ways to passively invest.

I understand they may want to limit viewings to serious buyers.The alternative is to write the viewing in as part of your offer along with the usual financing and inspection. 

I don't think that is a good idea because you can invest in alternative assets inside of an IRA or 401k.

Then again, many people who utilize their 401k for alternative investments are probably more likely to withdraw from the program in the first place.

I think it helps to think of both insurance and LLC's as components of a complete asset protection structure, as opposed to exclusive alternatives where getting once cancels the need for the other.

Rickey:A HELOC would work well if you are taking cash out of your primary residence.An alternative would be to get a portfolio loan against several of your rent properties to get the cash-out you need.