Pard, you're reaching relatively rarefied levels here, where the financial oxygen gets thin. I second Drifterrider's suggestion that you need a high-end CPA. You're probably - I didn't add it all up and you didn't give numbers for the rentals, but I think the income alone qualifies you - an accredited investor at this point. This opens some possibilities for buying into syndicates that provide tax credits for providing subsidized housing. If you think that's doing good, this offers a chance to do good with your money. A credit of $25K offsets $75 - 100K of income. Some limited partnerships in real estate can offer a substantial monthly income which is pretty much completely offset by depreciation. That piper will be paid eventually. These are not like the limited partnerships (such as oil drilling partnerships) that offer a tax loss - people that offer you a "tax" loss are almost always handing you a real loss, while these tax credit deals will generally get your money back to you. Eventually. Like, years and years from now. If you guess that I am easing out of such things because the lack of liquidity bugs me, you guess right.
You are probably also a sufficiently valuable employee that
-- if your CPA presents a solid plan for deferring a substantial fraction of your compensation years down the road, your company might well listen, and if it stays in business or the CPA proposes an escrow for the deferred compensation, might even do it. That deferred comp disappears from this year's income, reappears for taxation years later when you are not employed the way you are now.
-- you might be able to talk your company into a 200% match to 401(k). You put away 18K, they match with 37K (which would require a diminution of your salary), to build your retirement at close to the 55K annual max. This would affect all employees. My son got this implemented where he works and it has been a huge boon to the employees, has enhanced the recruiting of very smart financially-conservative new employees, and has cut back on corporate taxes because it lowers the bottom line.
Keep in mind that until you reach the stratosphere and are in it commercially, once you quit getting a salary your access to real estate loans can get pretty restricted. Get into the next 10 properties while you still "have a job."
Buy a farm. A real farm. Hobby farms don't count. It better quack like a duck and shit like a duck, because if the IRS thinks it's a hobby farm, things go badly for you. But assuming it's real, I can't believe, you can't believe, ain't nobody can believe, how much you can write off with a farm. (Need an ag CPA for this.)