If B - then the 60-day rollover is OK, as long as you carefully watch the 60-day deadline.

In addition your rollover from the Roth 401k is less than 5 years old.

However, if using a PM who would charge a 1 month rent fee for resigning a tenant to a 1 year lease, I would prefer to let the tenant automatically roll over to M2M to avoid that fee.

Following are the similarities and differences between the solo 401k and the self-directed IRA.The Self-Directed IRA and Solo 401k SimilaritiesBoth were created by congress for individuals to save for retirement;Both may be invested in alternative investments such as real estate, precious metals tax liens, promissory notes, private company shares, and stocks and mutual funds, to name a few;Both allow for Roth contributions;Both are subject to prohibited transaction rules;Both are subject to federal taxes at time of distribution;Both allow for checkbook control for placing alternative investments;Both may be invested in annuities;Both are protected from creditors;Both allow for nondeductible contributions; andBoth are prohibited from investing in assets listed under I.R.C. 408(m)The Self-Directed IRA and Solo 401k DifferencesIn order to open a solo 401k, self-employment, whether on a part-time or full-time basis, is required;To open a self-directed IRA, self-employment income is not required;In order to gain IRA checkbook control over the self-directed IRA funds, a limited liability company (IRA LLC)must be utilized;The solo 401k allows for checkbook control from the onset;The solo 401k allows for personal loan known as a solo 401k loan;It is prohibited to borrow from your IRA;The Solo 401k may be invested in life insurance;The self-directed IRA may not be invested in life insurance;The solo 401k allow for high contribution amounts (for 2018, the solo 401k contribution limit is $55,000, whereas the self-directed IRA contribution limit is $5,500);The solo 401k business owner can serve as trustee of the solo 401k;The self-directed IRA participant/owner may not serve as trustee or custodian of her IRA; instead, a trust company or bank institution is required;When distributions commence from the solo 401k a mandatory 20% of federal taxes must be withheld from each distribution and submitted electronically to the IRS by the 15th of the month following the date of each distribution;Rollovers and/or transfers from IRAs or qualified plans (e.g., former employer 401k) to a solo 401k are not reported on Form 5498, but rather on Form 5500-EZ, but only if the air market value of the solo 401k exceeds $250K as of the end of the plan year (generally 12/31);When funds are rolled over or transferred from an IRA or 401k to a self-directed IRA, the amount deposited into the self-directed IRA is reported on Form 5498 by the receiving self-directed IRA custodian by May of the year following the rollover/transfer.Rollovers (provided the 60 day rollover window is satisfied) from an IRA to a Solo 401k or self-directed IRA are reported on lines 15a and 15b of Form 1040;Pre-tax IRA contributions on reported on line 32 of Form 1040;Pre-tax solo 401k contributions are reported on line 28 of Form 1040;Roth solo 401k funds are subject to RMDs;A Roth 401k may be transferred to a Roth IRA (Note that from a planning perspective, it may be advantageous to transfer Roth Solo 401k funds to a Roth IRA before turning age 70 ½ in order to escape the Roth RMD requirement applicable to Roth 401k contributions including Roth Solo 401k contributions and earnings.)

(you cannot roll over a percentage of a property etc.

To do so you need to rollover your retirement funds into what is known as Self-Directed IRA. 

@Dmitriy Fomichenko or others, I have seen a couple of opinions in different discussions that seem to contradict each other in regards to partnerships and future deals in that partnership also.An example is that I have been talking to a couple of potential investing partners that might want to roll over IRA or 401 funds into a SDIRA or SOLO401K to invest within buy-n-hold rentals. 

Hello Everyone,I’m scheduled to close on the sale of my single family rental the first week in May, and will have ~$250k in equity to roll-over into one or more replacement properties.I’d really like to hear other member’s perspectives on the pros and cons of purchasing small multifamily (2-4 units) with 30 year fixed financing vs larger multifamily (5-20 units) or a mixed use property with a commercial loan, which would likely be a 15 year loan term with monthly payments based on a 25 year amortization of the debt.This is my first 1031 Exchange, and I greatly appreciate your ideas, perspectives, or shared experiences. 

As for the rollover in 3 years, take into consideration your market projections, lease-up costs, and account for any added risk in the cap rate.

Do transfers and/or direct rollovers from on custodian to the other-institution to institution.