What are the best ways for me to do this exercise without engaging a realtor?

Well this is a good exercise.

Rented 4 years without issues.....did so well my tenant bought own storeMEANWHILE, I've moved out of state, major politics happened, I'm in neutral position.My tenant wanted to buy my unit, politics...one association member exercised FIRST RIGHT TO BUY.Tenant moves out, politics delays the buying.....My buyer and I are looking at new tenant.6.

Any negative cash flow (underwater part) charge a monthly option payment to cover PITI + HOA.Give a strike price - exercise based on a new bank appraisal in 5 years or pay off the existing balance, up to you.

Failure to exercise this right, as indicated by your willingness to stay in the premises, pay rent, and not give proper written notice as most standard rental agreements call for, again, you have no one to blame.Finally, and with apologies to readers of this forum (who are obviously much better informed than the average mom & pop investor), many landlords are, well, less than professional.

The tenant has 2 years left on their inital lease and have not exercised any of their 5 year options mentioned above. 

However, I feel as passionate about it as my wife does about pottery; with that said, I feel that it is time for me to exercise what I'm learning so that I am ready to take advantage of that first opportunity when it arises.As of now, I am deployed but anxious to be home soon.

It is a little labor intensive, but not a bad exercise to get you familiar with talking to people (and getting used to rejections in my case :( )

Find a buyer that will buy it for $135,000 and exercise your option for $125,000, unless you can get it for less.

There are requirements that some debris must be in approved containers under the supervision of licensed contractors (even in the approved container is two plastic trash bags in a cardboard box with taped seals).If you have a house/structure to get rid of out in a rural area, your local fire department may solve most of your problem with a training exercise burning it down.