Fundrise Solo 401k UBTI and UDFI

[Mike S.]

Hi BP Community, 

I am searching and cannot find an answer to this so thought I would start a post and see if the BP community can help us navigate. My wife and I are looking to invest into Fundrise, an eReit, that invests in over 70+ properties in a single portfolio. The types of investments vary per property including debt and equity deals. I am told this may trigger UBTI. 

Since we are planning to invest using a Solo 401k, I was told by our CPA, UDFI will not apply to us. But I was also told that UBTI may still cause issues and I may need to file a 990-T if there are filing requirements met, which I assume is over $1000 in Unrelated Business Income. 

My questions are as follows:
1) Will the any of the dividends be subject to UBIT?
2) Will the K1s received be subject to UBIT?
3) What types of income will be subject to UBIT?

Any other advice related to Fundrise, Solo 401K investing in Reits, and UBTI would be greatly appreciated. Thanks Everyone!