UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                                    FORM 10-Q

[X] Quarterly Report Pursuant to Section 13 or 15(d) of the Securities  Exchange
Act of 1934

For the period ended September 30, 1999
                     ------------------

                                       or

[ ] Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange
Act of 1934 [No Fee Required]

For the transition period from               to
                              ---------------  ---------------

Commission File Number 0-14475
                       -------

                              PS PARTNERS IV, LTD.
           ---------------------------------------------------------
             (Exact name of registrant as specified in its charter)


          California                                          95-3931619
----------------------------------------                ----------------------
(State or other jurisdiction of                            (I.R.S. Employer
incorporation or organization)                          Identification Number)


           701 Western Avenue
          Glendale, California                                     91201-2394
----------------------------------------                ----------------------
(Address of principal executive offices)                           (Zip Code)

Registrant's telephone number, including area code:  (818) 244-8080
                                                     --------------

Indicate by check mark whether the registrant (1) has filed all reports required
to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during
the  preceding 12 months (or for such  shorter  period that the  registrant  was
required  to file  such  reports)  and  (2)  has  been  subject  to such  filing
requirements for the past 90 days.

                                    Yes X No
                                       ---  ---

<PAGE>

                                      INDEX



PART I.   FINANCIAL INFORMATION

         Condensed balance sheets at September 30, 1999
              and December 31, 1998                                       2

         Condensed statements of income for the three
              and nine months ended September 30, 1999 and 1998           3

         Condensed statements of cash flows for the
              nine months ended September 30, 1999 and 1998               4

         Notes to condensed financial statements                          5

         Management's discussion and analysis of financial condition
              and results of operations                                   6-10

PART II.  OTHER INFORMATION

         (Items 1 through 5 are not applicable)

         Item 6 - Exhibits and Reports on Form 8-K                        11

<PAGE>

                              PS PARTNERS IV, LTD.
                            CONDENSED BALANCE SHEETS


<TABLE>
<CAPTION>
                                                                                  September 30,      December 31,
                                                                                       1999             1998
                                                                                 -----------------------------------
                                                                                   (Unaudited)
                                     ASSETS
                                     ------


<S>                                                                                  <C>              <C>
Cash and cash equivalents                                                             $2,462,000       $3,414,000

Rent and other receivables                                                                 2,000            2,000

Real estate facility, at cost:
     Land                                                                                101,000          101,000
     Buildings and equipment                                                           1,536,000        1,534,000
                                                                                 -----------------------------------
                                                                                       1,637,000        1,635,000

     Less accumulated depreciation                                                      (698,000)        (647,000)
                                                                                 -----------------------------------
                                                                                         939,000          988,000

Investment in real estate entities                                                    14,702,000       16,115,000

Other assets                                                                               3,000            5,000
                                                                                 -----------------------------------

                                                                                     $18,108,000      $20,524,000
                                                                                 ===================================


                        LIABILITIES AND PARTNERS' EQUITY
                        --------------------------------


Accounts payable                                                                        $148,000         $122,000

Advance payments from renters                                                             11,000           12,000

Partners' equity:
     Limited partners' equity, $500 per unit, 128,000
         units authorized, issued and outstanding                                     17,687,000       20,103,000
     General partner's equity                                                            262,000          287,000
                                                                                 -----------------------------------

Total partners' equity                                                                17,949,000       20,390,000
                                                                                 -----------------------------------

                                                                                     $18,108,000      $20,524,000
                                                                                 ===================================
</TABLE>
                            See accompanying notes.
                                       2

<PAGE>

                              PS PARTNERS IV, LTD.
                         CONDENSED STATEMENTS OF INCOME
                                   (UNAUDITED)


<TABLE>
<CAPTION>
                                                             Three Months Ended                Nine Months Ended
                                                                September 30,                    September 30,
                                                       -------------------------------------------------------------------
                                                             1999            1998            1999              1998
                                                       -------------------------------------------------------------------

REVENUE:

<S>                                                          <C>              <C>          <C>               <C>
Rental income                                                 $83,000          $82,000       $231,000          $223,000
Equity in earnings of real estate entities                    761,000          695,000      2,189,000         1,863,000
Interest income                                                23,000           40,000         71,000            91,000
                                                       -------------------------------------------------------------------
                                                              867,000          817,000      2,491,000         2,177,000
                                                       -------------------------------------------------------------------

COSTS AND EXPENSES:

Cost of operations                                             37,000           31,000         98,000            86,000
Management fees                                                 5,000            6,000         14,000            14,000
Depreciation and amortization                                  17,000           16,000         51,000            49,000
Administrative                                                 36,000           41,000        119,000           125,000
                                                       -------------------------------------------------------------------
                                                               95,000           94,000        282,000           274,000
                                                       -------------------------------------------------------------------

NET INCOME                                                   $772,000         $723,000     $2,209,000        $1,903,000
                                                       ===================================================================

Limited partners' share of net income
     ($13.49 per unit in 1999 and
     $13.55 per unit in 1998)                                                              $1,727,000        $1,735,000
General partner's share of net income                                                         482,000           168,000
                                                                                       -----------------------------------
                                                                                           $2,209,000        $1,903,000
                                                                                       ===================================
</TABLE>
                            See accompanying notes.
                                       3

<PAGE>

                              PS PARTNERS IV, LTD.
                       CONDENSED STATEMENTS OF CASH FLOWS
                                   (UNAUDITED)


<TABLE>
<CAPTION>
                                                                                        Nine Months Ended
                                                                                          September 30,
                                                                               -------------------------------------
                                                                                      1999              1998
                                                                               -------------------------------------

CASH FLOWS FROM OPERATING ACTIVITIES:

     <S>                                                                            <C>                <C>
     Net income                                                                     $2,209,000         $1,903,000

     Adjustments to reconcile net income to net cash
         provided by operating activities

         Depreciation and amortization                                                  51,000             49,000
         Increase in rent and other receivables                                              -             (6,000)
         Decrease in other assets                                                        2,000                  -
         Increase (decrease) in accounts payable                                        26,000             (4,000)
         Decrease in advance payments from renters                                      (1,000)                 -
         Equity in earnings of real estate entities                                 (2,189,000)        (1,863,000)
                                                                               -------------------------------------

             Total adjustments                                                      (2,111,000)        (1,824,000)
                                                                               -------------------------------------

             Net cash provided by operating activities                                  98,000             79,000
                                                                               -------------------------------------

CASH FLOWS FROM INVESTING ACTIVITIES:

         Distributions from real estate entities                                     3,602,000          3,173,000
         Additions to real estate facility                                              (2,000)           (10,000)
                                                                               -------------------------------------

             Net cash provided by investing activities                               3,600,000          3,163,000
                                                                               -------------------------------------

CASH FLOWS FROM FINANCING ACTIVITIES:

         Distributions to partners                                                  (4,650,000)        (1,500,000)
                                                                               -------------------------------------

             Net cash used in financing activities                                  (4,650,000)        (1,500,000)
                                                                               -------------------------------------

Net (decrease) increase in cash and cash equivalents                                  (952,000)         1,742,000

Cash and cash equivalents at the beginning of the period                             3,414,000          1,293,000
                                                                               -------------------------------------

Cash and cash equivalents at the end of the period                                  $2,462,000         $3,035,000
                                                                               =====================================
</TABLE>
                            See accompanying notes.
                                       4

<PAGE>

                              PS PARTNERS IV, LTD.
                     NOTES TO CONDENSED FINANCIAL STATEMENTS
                               SEPTEMBER 30, 1999
                                   (UNAUDITED)


1.       The accompanying  unaudited  condensed  financial  statements have been
         prepared  pursuant to the rules and  regulations  of the Securities and
         Exchange  Commission.  Certain  information  and  footnote  disclosures
         normally included in financial  statements  prepared in accordance with
         generally accepted accounting principles have been condensed or omitted
         pursuant to such rules and regulations,  although  management  believes
         that  the  disclosures  contained  herein  are  adequate  to  make  the
         information   presented  not  misleading.   These  unaudited  condensed
         financial  statements  should be read in conjunction with the financial
         statements and related notes appearing in the  Partnership's  Form 10-K
         for the year ended December 31, 1998.

2.       In the opinion of  management,  the  accompanying  unaudited  condensed
         financial statements reflect all adjustments, consisting of only normal
         accruals,  necessary  to  present  fairly the  Partnership's  financial
         position at September 30, 1999, the results of operations for the three
         and nine months  ended  September  30, 1999 and 1998 and cash flows for
         the nine months then ended.

3.       The results of operations for the three and nine months ended September
         30, 1999 are not  necessarily  indicative of the results to be expected
         for the full year.

4.       In January 1997, the Joint Venture, PSI, and other related partnerships
         transferred  a total of 35  business  parks to PS  Business  Parks,  LP
         ("PSBPLP"), an operating partnership formed to own and operate business
         parks in which  PSI has a  significant  interest.  Included  among  the
         properties  transferred  were the  Joint  Venture's  business  parks in
         exchange for a partnership  interest in PSBPLP.  The general partner of
         PSBPLP is PS Business Parks, Inc.

5.       Summarized  combined  financial  data with  respect to the Real  Estate
         Entities is as follows:

                                             Nine Months Ended September 30,
                                             -------------------------------
                                                  1999               1998
                                             -------------      ------------

  Total revenues.......................       $104,130,000      $72,973,000
  Minority interest in income..........        $10,769,000       $8,696,000
  Net income...........................        $32,541,000      $22,987,000

                                       5

<PAGE>

                              PS PARTNERS IV, LTD.
                      MANAGEMENT'S DISCUSSION AND ANALYSIS
                OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS


FORWARD LOOKING STATEMENTS
--------------------------

         When  used  within  this  document,  the words  "expects,"  "believes,"
"anticipates,"  "should,"  "estimates," and similar  expressions are intended to
identify "forward-looking statements" within the meaning of that term in Section
27A of the  Securities  Exchange Act of 1933, as amended,  and in Section 21F of
the Securities Exchange Act of 1934, as amended. Such forward-looking statements
involve known and unknown risks,  uncertainties,  and other  factors,  which may
cause the actual  results and  performance  of the  Partnership to be materially
different  from those  expressed or implied in the forward  looking  statements.
Such factors include the impact of competition from new and existing real estate
facilities  which could  impact  rents and  occupancy  levels at the real estate
facilities that the Partnership has an interest in; the Partnership's ability to
effectively  compete in the markets that it does  business in; the impact of the
regulatory  environment  as  well  as  national,   state,  and  local  laws  and
regulations including, without limitation, those governing Partnerships; and the
impact of general economic  conditions upon rental rates and occupancy levels at
the real estate facilities that the Partnership has an interest in.

RESULTS OF OPERATIONS
---------------------

THREE MONTHS ENDED  SEPTEMBER 30, 1999 COMPARED TO THREE MONTHS ENDED  SEPTEMBER
30, 1998:

         The  Partnership's  net income for the three months ended September 30,
1999 was $772,000  compared to $723,000 for the three months ended September 30,
1998, representing an increase of $49,000, or 7%. The increase was primarily due
to the Partnership's  share of improved  property  operations at the real estate
facilities  that the  Partnership has an interest in combined with a decrease in
depreciation  expense  allocated  to the  Partnership  with respect to the Joint
Venture, offset by decreased interest income.

Property Operations
-------------------

         Rental  income  for  the  Partnership's   wholly-owned   mini-warehouse
property was $83,000  compared to $82,000 for the three  months ended  September
30, 1999 and 1998, respectively, representing an increase of $1,000, or 1%. Cost
of operations  (including  management fees) increased $5,000, or 14%, to $42,000
from  $37,000  for  the  three  months  ended   September  30,  1999  and  1998,
respectively.  Accordingly,  for the Partnership's  wholly-owned  mini-warehouse
property, property net operating income decreased by $4,000, or 9%, from $45,000
to $41,000 for the three months ended September 30, 1998 and 1999, respectively.

                                       6

<PAGE>

Equity in Earnings of Real Estate Entities
------------------------------------------

         Equity in earnings of real estate  entities  was  $761,000 in the three
months ended  September 30, 1999 as compared to $695,000 during the three months
ended September 30, 1998,  representing an increase of $66,000,  or 9%. This was
due primarily to the  Partnership's  share of improved  operating results at the
Joint  Venture's  mini-warehouses,  combined  with a  decrease  in  depreciation
expense allocated to the Partnership with respect to the Joint Venture.

Depreciation and Amortization
-----------------------------

         Depreciation and amortization  increased $1,000 from $16,000 to $17,000
for the three months ended September 30, 1998 and 1999, respectively.

NINE MONTHS ENDED SEPTEMBER 30, 1999 COMPARED TO NINE MONTHS ENDED SEPTEMBER 30,
1998:

         The  Partnership's  net income for the nine months ended  September 30,
1999 was $2,209,000  compared to $1,903,000 for the nine months ended  September
30,  1998,  representing  an increase of  $306,000,  or 16%.  The  increase  was
primarily due to the Partnership's  share of improved property operations at the
real  estate  facilities  that the  Partnership  has an interest  in,  offset by
decreased   interest  income  and  decreased   depreciation   allocated  to  the
Partnership with respect to the Joint Venture.

Property Operations
-------------------

         Rental  income  for  the  Partnership's   wholly-owned   mini-warehouse
property was $231,000  compared to $223,000 for the nine months ended  September
30, 1999 and 1998, respectively, representing an increase of $8,000, or 4%. Cost
of operations (including management fees) increased $12,000, or 12%, to $112,000
from  $100,000  for  the  nine  months  ended   September  30,  1999  and  1998,
respectively.  Accordingly,  for the Partnership's  wholly-owned  mini-warehouse
property,  property  net  operating  income  decreased  by $4,000,  or 3%,  from
$123,000 to  $119,000  for the nine months  ended  September  30, 1998 and 1999,
respectively.

Equity in Earnings of Real Estate Entities
------------------------------------------

         Equity in earnings of real estate  entities was  $2,189,000 in the nine
months ended September 30, 1999 as compared to $1,863,000 during the nine months
ended September 30, 1998, representing an increase of $326,000, or 17%. This was
due primarily to the  Partnership's  share of improved  operating results at the

                                       7

<PAGE>

Joint  Venture's  mini-warehouses,  combined  with a  decrease  in  depreciation
expense allocated to the Partnership with respect to the Joint Venture.

Depreciation and Amortization
-----------------------------

         Depreciation and amortization  increased $2,000, or 4%, from $49,000 to
$51,000 for the nine months  ended  September  30, 1998 and 1999,  respectively.
This  increase  was  primarily  attributable  to  the  depreciation  of  capital
expenditures made during 1998 and 1999.

SUPPLEMENTAL PROPERTY DATA
--------------------------

         Most of the Partnership's net income is from the Partnership's share of
the operating results of the Mini-Warehouse  Properties.  Therefore, in order to
evaluate the Partnership's  operating results,  the General Partners analyze the
operating performance of the Mini-Warehouse Properties.

THREE MONTHS ENDED  SEPTEMBER 30, 1999 COMPARED TO THREE MONTHS ENDED  SEPTEMBER
30, 1998:

         Rental income for the Mini-Warehouse Properties was $3,394,000 compared
to  $3,342,000  for  the  three  months  ended  September  30,  1999  and  1998,
respectively, representing an increase of $52,000, or 2%. The increase in rental
income  was   primarily   attributable   to   increased   rental  rates  at  the
Mini-Warehouse  Properties,  partially  offset by  decreased  average  occupancy
rates. The annual average  realized rent per square foot for the  Mini-Warehouse
Properties was $8.17 compared to $7.98 for the three months ended  September 30,
1999 and  1998,  respectively.  The  weighted  average  occupancy  levels at the
Mini-Warehouse  Properties  decreased from 92% to 91% for the three months ended
September  30,  1998  and  1999,  respectively.  Cost of  operations  (including
management fees) decreased $23,000, or 2%, to $1,295,000 from $1,318,000 for the
three months ended September 30, 1999 and 1998,  respectively.  This decrease is
primarily  attributable  to lower  property tax expenses.  Accordingly,  for the
Mini-Warehouse  Properties,  property net operating income increased by $75,000,
or 4%, from  $2,024,000 to $2,099,000  for the three months ended  September 30,
1998 and 1999, respectively.

NINE MONTHS ENDED SEPTEMBER 30, 1999 COMPARED TO NINE MONTHS ENDED SEPTEMBER 30,
1998:

         Rental income for the Mini-Warehouse Properties was $9,886,000 compared
to  $9,613,000  for  the  nine  months  ended   September  30,  1999  and  1998,
respectively,  representing  an increase  of  $273,000,  or 3%. The  increase in
rental  income was  primarily  attributable  to  increased  rental  rates at the
Mini-Warehouse.  The  annual  average  realized  rent  per  square  foot for the
Mini-Warehouse  Properties was $8.01 compared to $7.78 for the nine months ended
September 30, 1999 and 1998, respectively. The weighted average occupancy levels

                                       8

<PAGE>

at the  Mini-Warehouse  Properties  remained  stable at 90% for the nine  months
ended  September  30, 1998 and 1999.  Cost of operations  (including  management
fees)  increased  $25,000,  or 1%, to $3,770,000  from  $3,745,000  for the nine
months  ended  September  30, 1999 and 1998,  respectively.  This  increase  was
primarily  attributable to increases in advertising and promotion (due primarily
to the PSI national  telephone  reservation  center) and repairs and maintenance
expenses,  offset  by  lower  property  tax  expenses.   Accordingly,   for  the
Mini-Warehouse Properties,  property net operating income increased by $248,000,
or 4%, from  $5,868,000  to $6,116,000  for the nine months ended  September 30,
1998 and 1999, respectively.

Liquidity and Capital Resources
-------------------------------

         The Partnership has adequate sources of cash to finance its operations,
both on a short-term and long-term  basis,  primarily from internally  generated
cash from property operations and cash reserves.  Cash generated from operations
and  distributions  from real estate  entities  ($3,700,000  for the nine months
ended September 30, 1999) has been sufficient to meet all current obligations of
the Partnership.

         During 1999, the Partnership does not anticipate incurring  significant
costs for capital  improvements  for the  Partnership's  wholly-owned  property.
Total  capital  improvements  for the nine months ended  September 30, 1999 with
respect to this property was $2,000.

         The Partnership paid  distributions to the limited and general partners
totaling  $4,143,000  ($32.38 per unit) and $507,000,  respectively,  during the
first nine months of 1999. Future  distribution  rates may be adjusted to levels
which are supported by operating  cash flow after capital  improvements  and any
other necessary obligations.

Impact of the Year 2000 Issue
-----------------------------

         The Partnership  utilizes Public  Storage,  Inc.'s ("PSI")  information
systems in connection with a cost sharing and administrative services agreement.
PSI has completed an assessment of all of its hardware and software applications
to identify  susceptibility  to what is commonly  referred to as the "Y2K Issue"
whereby certain computer programs have been written using two digits rather than
four to define the applicable  year. Any of PSI's computer  programs or hardware
with the Y2K Issue that have  date-sensitive  applications or embedded chips may
recognize  a date  using  "00" as the year  1900  rather  than  the  year  2000,
resulting  in   miscalculations   or  system  failure  causing   disruptions  of
operations.

         PSI has two phases in its process  with respect to each of its systems;
i)  assessment,  whereby PSI  evaluates  whether the system is Y2K compliant and

                                       9

<PAGE>

identifies  the plan of  action  with  respect  to  remediating  any Y2K  issues
identified  and ii)  implementation,  whereby PSI  completes  the plan of action
prepared in the  assessment  phase and  verifies  that Y2K  compliance  has been
achieved.

         Implementations have been completed on PSI's critical applications that
impact the Partnership,  such as the general ledger,  property  operations,  and
related  systems.  Contingency  plans have been  developed for use in case PSI's
assessment  may  have  not  been  able to  identify  all Y2K  issues,  or if the
implementations  were subsequently  determined to not fully remediate Y2K issues
that were  identified.  While PSI presently  believes that the impact of the Y2K
Issue on its  systems can be  mitigated,  if PSI's plan for  ensuring  Year 2000
compliance and the related  contingency plans were to fail, be insufficient,  or
not be implemented on a timely basis, Partnership operations could be materially
impacted.

         Certain  of  PSI's  other  non-computer  related  systems  that  may be
impacted by the Y2K Issue, such as security systems, have been evaluated.  Based
upon its  evaluation,  PSI has no reason to believe that lack of  compliance  or
failure  of  required   solutions  would  materially  impact  the  Partnership's
operations.

         The Partnership  exchanges electronic data with certain outside vendors
in the banking and payroll processing areas. The Partnership has been advised by
these vendors that their systems are Year 2000 compliant. The Partnership is not
aware of any other vendors, suppliers, or other external agents with a Y2K Issue
that would materially impact the Partnership's results of operations, liquidity,
or capital  resources.  However,  the  Partnership has no means of ensuring that
external agents will be Year 2000 compliant,  and there can be no assurance that
PSI has identified all such external agents. The inability of external agents to
complete their Year 2000 compliance process in a timely fashion could materially
impact the Partnership.  The effect of  non-compliance by external agents is not
determinable.

         The cost of PSI's  year 2000  compliance  activities  (which  primarily
consists of the costs of new  systems) to be  allocated  to the  Partnership  is
estimated at approximately  $148,000.  These costs are  capitalized.  PSI's year
2000 compliance efforts have not resulted in any significant  deferrals in other
information system projects.

         The costs of the  projects and the date on which PSI expects to achieve
Year 2000  Compliance  are based  upon  management's  best  estimates,  and were
derived  utilizing  numerous  assumptions  of  future  events.  There  can be no
assurance that these estimates will be achieved, and actual results could differ
materially  from  those  anticipated.  There  can be no  assurance  that PSI has
identified all potential Y2K Issues either within the Partnership,  at PSI or at
external  agents.  In  addition,  the  impact of the Y2K  issue on  governmental
entities and utility  providers and the resultant impact on the Partnership,  as
well as  disruptions  in the  general  economy,  may be  material  but cannot be
reasonably determined or quantified.

                                       10

<PAGE>

                           PART II. OTHER INFORMATION

ITEMS 1 through 5 are not applicable.

Item 6   Exhibits and Reports on Form 8-K
         --------------------------------

         (a)      The following Exhibits are included herein:

                  (27)     Financial Data Schedule

         (b)      Reports on Form 8-K

                  None

                                   SIGNATURES

         Pursuant to the  requirements  of the Securities  Exchange Act of 1934,
the  Registrant  has duly  caused  this report to be signed on its behalf by the
undersigned thereunto duly authorized.


                          DATED: November 12, 1999



                                 PS PARTNERS IV, LTD.

                          BY:    Public Storage, Inc.
                                 General Partner



                          BY:    /s/ John Reyes
                                 ---------------------------------------------
                                 John Reyes
                                 Senior Vice President and Chief Financial
                                 Officer of Public Storage, Inc.
                                 (principal financial and accounting officer)

                                       11