Debt Instrument, Decrease In Periodic Payment

No definition available.

Name:	cik0001645873_DebtInstrumentDecreaseInPeriodicPayment
Namespace Prefix:	cik0001645873_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Impairment Of Real Estate, Percentage

+ References

No definition available.

+ Details

Name:	cik0001645873_ImpairmentOfRealEstatePercentage
Namespace Prefix:	cik0001645873_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Impairment Of Real Estate Property, Reversal

+ References

No definition available.

+ Details

Name:	cik0001645873_ImpairmentOfRealEstatePropertyReversal
Namespace Prefix:	cik0001645873_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Lessor, Operating Lease, Early Termination Fee To Be Received

+ References

No definition available.

+ Details

Name:	cik0001645873_LessorOperatingLeaseEarlyTerminationFeeToBeReceived
Namespace Prefix:	cik0001645873_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Lessor, Operating Lease, Monthly Payments To Be Received

+ References

No definition available.

+ Details

Name:	cik0001645873_LessorOperatingLeaseMonthlyPaymentsToBeReceived
Namespace Prefix:	cik0001645873_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Number Of Impaired Real Estate Properties, Vacant

+ References

No definition available.

+ Details

Name:	cik0001645873_NumberOfImpairedRealEstatePropertiesVacant
Namespace Prefix:	cik0001645873_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Number Of Operating Leases With Tenant Improvements

+ References

No definition available.

+ Details

Name:	cik0001645873_NumberOfOperatingLeasesWithTenantImprovements
Namespace Prefix:	cik0001645873_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of Real Estate Properties Held for Investment

+ References

No definition available.

+ Details

Name:	cik0001645873_NumberOfRealEstatePropertiesHeldForInvestment
Namespace Prefix:	cik0001645873_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Number Of Real Estate Properties, Held-For-Sale

+ References

No definition available.

+ Details

Name:	cik0001645873_NumberOfRealEstatePropertiesHeldForSale
Namespace Prefix:	cik0001645873_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Number of Real Estate Properties, Identified As Held-for-Sale During Period

+ References

No definition available.

+ Details

Name:	cik0001645873_NumberOfRealEstatePropertiesIdentifiedAsHeldForSaleDuringPeriod
Namespace Prefix:	cik0001645873_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of Real Estate Properties, Sold

+ References

No definition available.

+ Details

Name:	cik0001645873_NumberOfRealEstatePropertiesSold
Namespace Prefix:	cik0001645873_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

This element represents the amount of revenue of the acquiree since the acquisition date included in the consolidated income statement for the reporting period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)
-URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463

+ Details

Name:	us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of the required periodic payments including both interest and principal payments.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22)
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=123599511&loc=d3e64711-112823

+ Details

Name:	us-gaap_DebtInstrumentPeriodicPayment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of consideration received or receivable for the disposal of assets and liabilities, including discontinued operation.

+ References

No definition available.

+ Details

Name:	us-gaap_DisposalGroupIncludingDiscontinuedOperationConsideration
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Remaining amortization period of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 926
-SubTopic 20
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=120154696&loc=d3e54445-107959

+ Details

Name:	us-gaap_FiniteLivedIntangibleAssetsRemainingAmortizationPeriod1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

The net gain (loss) resulting from sales and other disposals of real estate owned for investment purposes.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(b)(9)(a))
-URI http://asc.fasb.org/extlink&oid=123367319&loc=SL114868664-224227

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 360
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=123605587&loc=d3e23528-158515

Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(b)(7)(c))
-URI http://asc.fasb.org/extlink&oid=123367319&loc=SL114868664-224227

Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04(14)(d))
-URI http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 360
-Section 45
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=123605564&loc=d3e23439-158514

Reference 7: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04(3)(a))
-URI http://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 360
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=123605564&loc=d3e23415-158514

+ Details

Name:	us-gaap_GainsLossesOnSalesOfInvestmentRealEstate
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The charge against earnings in the period to reduce the carrying amount of real property to fair value.

+ References

+ Details

Name:	us-gaap_ImpairmentOfRealEstate
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Term of lessor's operating lease renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 30
-Section 50
-Paragraph 3
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=124258985&loc=SL77919359-209981

+ Details

Name:	us-gaap_LessorOperatingLeaseRenewalTerm
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	instant

- Definition

Carrying amounts due as of the balance sheet date of the sum of amounts receivable other than from customers.

+ References

+ Details

Name:	us-gaap_NontradeReceivables
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The number of real estate properties owned as of the balance sheet date.

+ References

No definition available.

+ Details

Name:	us-gaap_NumberOfRealEstateProperties
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

The number of states the entity operates in as of the balance sheet date.

+ References

No definition available.

+ Details

Name:	us-gaap_NumberOfStatesInWhichEntityOperates
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of cash outflow for costs that are essential to originate the lease and would not otherwise have been incurred without the lease agreement. Amount includes, but is not limited to, cash outflows to evaluate the lessee's credit condition, guarantees, and collateral and cash outflows for costs incurred in negotiating, processing, and executing the lease agreement.

+ References

No definition available.

+ Details

Name:	us-gaap_PaymentsForLeasingCosts
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Cash received for the sale of real estate that is not part of an investing activity during the current period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3179-108585

+ Details

Name:	us-gaap_ProceedsFromSaleOfRealEstate
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Carrying amount as of the balance sheet date of investments in land and buildings held for sale, excluding real estate considered to be inventory of the entity.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.1(f))
-URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910

+ Details

Name:	us-gaap_RealEstateHeldforsale
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of real estate investment property, net of accumulated depreciation, which may include the following: (1) land available-for-sale; (2) land available-for-development; (3) investments in building and building improvements; (4) tenant allowances; (5) developments in-process; (6) rental properties; and (7) other real estate investments.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.1(d))
-URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910

+ Details

Name:	us-gaap_RealEstateInvestmentPropertyNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_RealEstateLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=cik0001645873_TwentyFourHourFitnessMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=cik0001645873_RaisingCanesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=cik0001645873_DanaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_MortgagesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis=srt_RetailSiteMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=cik0001645873_ChevronGasStationRosevilleMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=cik0001645873_EcothriftMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=cik0001645873_ChevronGasStationSanJoseMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=cik0001645873_RiteAidMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=cik0001645873_WalgreensStockbridgeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=cik0001645873_IslandPacificMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=cik0001645873_WalgreensSantaMariaandStockbridgeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=cik0001645873_WalgreensSantaMariaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=cik0001645873_PreKEducationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=cik0001645873_HarleyDavidsonMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_StatementScenarioAxis=us-gaap_ScenarioPlanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis=srt_OfficeBuildingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis=srt_IndustrialPropertyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

REAL ESTATE INVESTMENTS, NET - Narrative (Details)											3 Months Ended						4 Months Ended	6 Months Ended	9 Months Ended
REAL ESTATE INVESTMENTS, NET - Narrative (Details)	Jul. 20, 2021 USD ($)	Jul. 07, 2021 USD ($)	Feb. 12, 2021 USD ($)	Jan. 29, 2021 USD ($)	Jan. 07, 2021 USD ($)	Dec. 31, 2020 USD ($) lease property	Sep. 16, 2020 USD ($)	Aug. 27, 2020 USD ($)	Aug. 03, 2020 USD ($)	Apr. 01, 2020 USD ($)	Sep. 30, 2021 USD ($)	Jun. 30, 2021 lease	Mar. 31, 2021 USD ($) property	Sep. 30, 2020 USD ($) lease	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($) property	Apr. 30, 2020 USD ($) lease	Dec. 31, 2020 USD ($) lease property	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($) lease	Sep. 30, 2021 USD ($)	Sep. 30, 2021 property	Sep. 30, 2021 state	Sep. 30, 2021 lease
Real Estate [Line Items]
Number of real estate properties \| property																						38
Number of states in which entity operates \| state																							14
Number of impaired real estate properties, vacant \| property																2
Impairment of real estate investment properties											$ 0			$ 0	$ 349,457	$ 9,157,068			$ 0	$ 9,506,525
Impairment charge percentage														0.10%		2.20%				0.10%
Note receivable						$ 1,824,383												$ 1,824,383			$ 1,966,767
Gain on sale of real estate investments											4,242,771			$ 1,693,642					$ 4,532,413	$ 1,693,642
Weighted-average remaining amortization period																			9 years 3 months 18 days
Number of real estate properties identified as held-for-sale \| property																		9
Number of real estate properties sold \| lease																		5
Number of real estate properties, held-for-sale						2								3				2		3		0		0
Number of real estate properties held for investment \| lease						2												2
Real estate investment held for investment						$ 329,456,639												$ 329,456,639			329,689,217
24 Hour Fitness
Real Estate [Line Items]
Gain on sale of real estate investments																			$ 115,133
Raising Cane's
Real Estate [Line Items]
Revenue related to acquisition											47,004								$ 47,004
Dana
Real Estate [Line Items]
Monthly rent payments		$ 65,000
Early termination fee		1,381,767
Mortgages \| 24 Hour Fitness
Real Estate [Line Items]
Monthly mortgage payment										$ 32,000
Decrease in monthly mortgage payment										$ 8,000
Retail
Real Estate [Line Items]
Number of real estate properties \| property																						13
Disposal group, including discontinued operation, consideration														$ 15,943,462						$ 15,943,462
Gain on sale of real estate investments																				1,693,642
Number of real estate properties identified as held-for-sale \| property													8
Number of real estate properties sold \| lease												3						4
Number of real estate properties, held-for-sale \| lease						4												4
Retail \| 24 Hour Fitness
Real Estate [Line Items]
Impairment of real estate investment properties																				5,664,517
Retail \| Raising Cane's
Real Estate [Line Items]
Real estate investment held for investment																					3,620,000
Retail \| Chevron Gas Station, Roseville property
Real Estate [Line Items]
Disposal group, including discontinued operation, consideration					$ 4,050,000
Proceeds from sale of real estate investments					3,914,909
Gain on sale of real estate investments					$ 228,769
Retail \| EcoThrift
Real Estate [Line Items]
Disposal group, including discontinued operation, consideration				$ 5,375,300
Proceeds from sale of real estate investments				2,684,225
Gain on sale of real estate investments				$ 51,415
Retail \| Chevron Gas Station, San Jose property
Real Estate [Line Items]
Disposal group, including discontinued operation, consideration			$ 4,288,888
Proceeds from sale of real estate investments			4,054,327
Gain on sale of real estate investments			$ 9,458
Retail \| Rite Aid
Real Estate [Line Items]
Disposal group, including discontinued operation, consideration									$ 7,250,000
Proceeds from sale of real estate investments									3,299,016
Gain on sale of real estate investments									$ (422)
Retail \| Walgreens
Real Estate [Line Items]
Disposal group, including discontinued operation, consideration								$ 5,538,462
Proceeds from sale of real estate investments								5,296,356
Gain on sale of real estate investments								$ 1,306,768
Operating leases extension																	10 years
Retail \| Island Pacific
Real Estate [Line Items]
Disposal group, including discontinued operation, consideration							$ 3,155,000
Proceeds from sale of real estate investments							1,124,016
Gain on sale of real estate investments							$ 387,296
Retail \| Walgreens Santa Maria and Stockbridge
Real Estate [Line Items]
Aggregate payment of lease incentives																	$ 990,000
Number of operating leases with lease incentives \| lease																	2
Retail \| Walgreens
Real Estate [Line Items]
Operating leases extension																	10 years
Real estate investment held for investment																					5,326,706
Retail \| PreK Education
Real Estate [Line Items]
Aggregate payment of lease incentives											$ 2,000,000
Operating leases extension											8 years								8 years
Retail \| Harley Davidson
Real Estate [Line Items]
Impairment of real estate investment properties						$ 632,233
Real estate held for sale						$ 12,010,919												$ 12,010,919			11,860,000
Impairment reversal of real estate properties											$ 400,999
Retail \| Harley Davidson \| Scenario, Plan
Real Estate [Line Items]
Proceeds from sale of real estate investments													$ 12,117,500
Real estate investment held for investment																					$ 11,779,687
Office
Real Estate [Line Items]
Number of real estate properties \| property																						14
Industrial
Real Estate [Line Items]
Number of real estate properties \| property																						11
Number of real estate properties identified as held-for-sale \| property													1
Number of real estate properties sold \| lease																		1
Industrial \| Dana
Real Estate [Line Items]
Impairment of real estate investment properties																				2,184,395
Disposal group, including discontinued operation, consideration		10,000,000
Proceeds from sale of real estate investments		$ 4,975,334
Gain on sale of real estate investments	$ 4,127,638
Industrial \| Rite Aid
Real Estate [Line Items]
Impairment of real estate investment properties																				$ 349,457