I will have a solo 401k soon, and I already have an LLC that generates active income.My ultimate question is this; is there a way to use my solo 401k to reduce my current tax liability?  

Our booking lead time has greatly reduced but the holidays are mostly booked. 

Is there any proactive action I can take to highly discourage this abandonment or will I have to take the steps for abandoned property? 

If they are all single family houses, then if you do anything else, you may reduce the property value of all the single family houses, including yours.If there is a mix of industrial, commercial and residential, and the zoning allows, look and see what businesses are there, what businesses are needed and with the existing house, and the street viewshed, what businesses you can add that are needed or desired. 

After reaching a savings/debt-reducing or investing goal, reward yourself in some way. 

And yes, i have reduced the sale and leasing price.

., to reduce the taxable income.The resulting net taxable income is then run through the trust tax table to determine the tax amount.Generally speaking, while there is the UBIT cost associated with the use of debt-financing in an IRA, the net after-tax return should still be better in a leveraged scenario than an all cash scenario.

It reduces their taxable amount.... 

You're better off reducing the price by $100 and get it filled!

I think there is a compassionate and proactive way to respond to this situation.